(OSB) consist of composite material, made from crushed wood chips glued with various resins, adhesives and polymers. To protect the OSB board from moisture, it is impregnated with a composition that repels water or painted.
OSB boards come with different chemical compositions of impregnations, fillers and protective coatings, so they come in 4 types:
- OSB – 1 – withstands minimal humidity in dry rooms, since there is practically no moisture-proof component in the boards;
- OSB – 2 – withstands average indoor humidity;
- OSB – 3 – withstands high background humidity indoors and accidental wetting;
- OSB – 4 – can withstand high humidity inside and outside buildings.
Why do you need to paint slabs?
Coating OSB boards with paints and varnishes has its advantages:
- Create with paint or varnish additional protection from moisture. Water will not be able to penetrate the structure of the slab - deformation will not occur inside and on the surface of the OSB.
- Modern paints mask the texture of the slabs, so large chips are almost invisible.
- Painting is not as labor-intensive as cladding with decorative panels and is cheaper.
It is important to know. OSB is painted and then varnished only for interior work. From the outside, the slabs are protected using more serious methods due to significant climatic influences.
Which paint to choose for interior work?
You can paint with any material, taking into account its characteristics. Since they are glued together with resins and polymers, it is better to use solvent-soluble pigments for painting for maximum adhesion of the paint and the board when the pigments penetrate into the panel structure:
- Coating with oil paints is considered the best option due to their high viscosity and low absorption into the slab. The paint takes a long time to dry, but provides a high-quality and reliable protective layer.
- Coating with alkyd enamels or special alkyd paints for wood panels guarantees long service life due to deep penetration into the structure of the material. In this case, you can refuse to apply varnish on top of the paint. This allows you to reduce finishing costs.
- You can use an acrylic water-dispersed composition, but then the slab may swell from exposure to the liquid.
If there is no need to cover the texture, then use impregnations, for example, Valtti Color Satin from Tikkurila. These products create a tonic protective film with a semi-gloss or matte texture.
Zinga electrically conductive metallic paint can be used for decorative purposes, provided the substrate is carefully prepared. To protect the panels from fire, use antipyretics developed for wooden coverings: Vuprotek, SPAS and their analogues.
How to prepare the surface of the slabs for painting?
The better the sheets are prepared, the better the adhesion of the paint or varnish to the base and the more durable the protective layer. There is no point in painting OSB panels before installation, since already installed sheathing is often touched up due to fitting, sanding, etc.
Using special tool pre-processing is performed in the following sequence:
Grinding
Sandpaper is used to thoroughly sand the OSB board to mask the recognizable texture and prevent primer and paint from penetrating into it.
It is important to know. OSB-3 boards should be sanded deeply and thoroughly to remove the outer wax-varnish coating.
Alignment
Get rid of irregularities and dimples in places where screws are attached using oil-adhesive putty mixtures. You should not fill the recesses between the slabs with the mixture; the seams will still appear after painting. Decorative strips will fit better. A perfectly smooth surface is obtained after sanding dried putty.
Primer
The easiest way to prime an OSB board is to coat it with a mixture of acrylic or acrylic-polyurethane water-based wood varnish in a ratio of 1:10. Apply thoroughly to ensure even coverage. An alternative is alkyd varnish diluted with white spirit rather than water.
Adhesive primers in the form of Aqua-Filler and its analogues can thoroughly isolate slabs from layers of paint. They will not allow leakage from the slab structure essential oils, and no stains will be visible under the light pigment of the paint.
Paint application and drying
The work is carried out in the following sequence:
- The primed surface is painted around the perimeter with a brush, 2-3 layers of material are applied to the edges - it will quickly be absorbed. Next, use a roller to evenly distribute the composition over the fibers of the slab;
- apply the composition with a roller in a thin layer on the unsanded side of the slab, laying the paint in one direction;
- OSB panels are thoroughly dried, avoiding drafts and sudden changes in temperature;
- after 8 hours, apply a second layer, maintaining or hiding the texture.
It is important to know. When coating with water-dispersed compositions, it is necessary to distribute them over the surface in equal quantities. Since the OSB board will swell anyway, this will happen evenly over the entire surface.
Exterior paint
The outside of OSB can be painted with alkyd, acrylic, oil and latex paints. OSB finishes the façade, installs internal partitions and floor coverings. For the finishing coating, paints are used as the most affordable and inexpensive way decorative cladding.
Alkyd paint
It contains a resin made from a mixture of acids and vegetable oil. A thin but durable film will protect the surface from moisture after the alkyd paint has dried.
Pros:
- low cost of paint;
- a moisture-proofing layer is created;
- tolerates direct sunlight and frost up to 30°C;
- dries quickly;
- no toxicity.
Minuses:
- the paint is prone to fire, does not tolerate alkaline exposure, and smells unpleasant when applied and dries.
Advice: alkyd composition should be applied to the OSB surface after thorough drying to avoid the appearance of peeling and blistering.
Water-based paint
It is especially popular. It consists of water and acrylics - binding elements. When dry, the water evaporates and the protection from a reliable polymer layer remains.
Pros:
- easy to use;
- There are all kinds of colors;
- is inexpensive;
- is resistant to moisture and sudden temperature changes;
- high fire resistance;
- is environmentally friendly;
- no unpleasant odors;
- service life – up to 10 years.
Adviсe:
- do not store water-based paint in the cold, do not pour water into the jar, as it will render the paint composition unusable;
- metallic paints (Polistil) are fireproof. In the event of a fire, they can release coked foam to stop further spread of fire.
Oil paints
Drying oil-based products are used less frequently due to toxicity, smudges during application, long drying time and fragility - it quickly crumbles and peels.
Latex paint
It is a type of water-emulsion with a binder - latex. The paint is characterized by elasticity and high strength to mechanical influences, moisture insulation, resistance to atmospheric influences, and household chemicals. Environmentally safe, no unpleasant odors.
Here you will receive detailed information about how and with what to paint an OSB board on the outside and what difficulties may be associated with the choice of paint. This one appeared construction material recently. Correct abbreviation These boards are oriented strand board, abbreviated as OSB. Oriented strand board (OSB) is made from waste wood and needs to be protected from water and rot. Like other wood, OSB needs to be painted to protect it from moisture and, ultimately, from rotting and decay if it is located outside.
There are four classes of boards in total: from OSB-1 to OSB-4. Each class has its own purpose:
OSB-1 is used in indoors as furniture elements;
OSB-2 is used in the production of composite I-beams;
OSB-3 has the same application as OSB-2, but at high humidity;
OSB-4 is also used in the production of composite I-beams for floors with increased load and humidity. In terms of strength characteristics, they rank after plywood and are ahead of chipboard.
In addition, the slabs are varnished, laminated and made with a tongue-and-groove joint. All four types of OSB boards, if they are located outside, need protection from mold and putrefactive fungi.
Did you know that oriented strand boards come in... different thicknesses: from 6 to 22 mm.
Experts recommend using OSB-3 and OSB-4 for exterior work, but the first option is less preferable. Slabs of the third category do not have special protection against moisture, so they require additional processing. OSB-4 is much more expensive, so for facade works it is rarely chosen when constructing economical housing.
The technology for preparing facades made of OSB boards for painting is the same for all types of paints.
Pore filling
First of all, it is necessary to fill the pores that the OSB board has. Every tree contains hundreds of microscopic pores per square centimeter for the passage of water and nutrients. After the OSB board is formed and pressed, the sheets are polished. After grinding, microscopic pores open, and not only moisture can get into them, but also spores of mold and putrefactive fungi.
If the consumer wishes to leave natural look OSB boards and cover it with transparent wood varnish, then you need to use a special filler varnish.
Grinding
After the first application, the surface is sanded. This is a required step.
Sanding is done because the varnish raises microscopic fibers and the surface becomes like a hedgehog. These fibers are removed by sanding.
After the first layer of filler, apply the second. To obtain a high-quality surface, each subsequent layer of enamel or varnish is sanded. If such quality is not required, then grinding the primer or filler does not need to be done.
Before painting OSB, you need to select a primer. Its purpose is to fill pores in wood and create a preparatory layer for painting.
Primer
The industry produces five alkyd types primers and only glyphthalic is suitable for OSB. It is universal and suitable not only for wood, but also for concrete, glass and other materials. Glypthal primers (GF) can be used indoors and outdoors. They are liquid and easily penetrate into pores.
Their use not only significantly extends the service life of OSB boards, but also makes the painted surface water-repellent. Apply GF primer with a brush or roller. Drying time at room temperature at least a day.
Glypthal primer is fire hazardous and toxic. It is recommended to use it outside or in a ventilated area; a respirator will not help here.
Tip: before applying primer, you need to remove dust from the surface, preferably with a vacuum cleaner.
OSB slabs must be primed several times with intermediate sanding of each layer until the result is smooth and smooth surface. Why do you need to sand each layer? The fact is that the soil, filling the pores, creates a waviness that is invisible to the eye. And although these waves are measured in hundredths of a millimeter, in the sun, due to light and shadow, the OSB surface receives spots visible to the eye.
What to paint: types of paints for facades made of OSB boards
For exterior painting of oriented strand board, it is recommended to use four types paints
Alkyd paints
After priming and sanding the OSB, you can begin painting with alkyd enamels. The base for this paint is alkyd resins. This synthetic substance is obtained by processing vegetable oils organic acids at high temperatures. This paint is applied with a roller, brush or spray. To get high high-quality surface Each layer must be sanded, and after each sanding the dust must be removed.
Main advantages alkyd enamel – affordable price, resistance to sunlight and low temperatures(up to -30 degrees). It dries quite quickly (up to 10 hours), but is flammable and has a strong unpleasant odor.
Acrylic paints
Acrylic paints are a suspended water-dispersed mixture of dyes in solution acrylic resins and polyurethane. Distinctive feature acrylic - the use of water as a solvent, due to which this type of paint composition has become widely popular for external and internal work. Before painting the OSB board, it is necessary to apply an acrylic primer to it.
Acrylic paints for wood are opaque and after they dry, a durable film remains. To achieve different design effects, special substances – plasticizers – are added to the paint to impart beneficial properties. Acrylic paints come in matte, semi-matte and glossy.
This best option- both in terms of cost and duration of operation. Quite unpretentious paint, easy to apply, resistant to various weather conditions. Wealth color range created using colors is a definite plus.
Oil paints
Oil paints are not suitable for external use in conditions high humidity, although there are oil enamels for exterior use. This type of enamels was invented back in the last century. During this time, many paints with better characteristics appeared.
Preparation of OSB for oil paints is the same as for alkyd paints described above.
The OSB surface must be clean, dry, and free of grease. Primer for oil paint is applied to the slab. On top of the primer - at least two layers of paint. To obtain a high-quality surface, each layer must be sanded.
It is becoming less and less popular due to a large number of shortcomings. It is toxic, leaves streaks and takes a long time to dry. The durability of such a coating leaves much to be desired: under the influence of the sun and time, it fades and peels off. The price is above average.
Latex paints
Latex paints are obtained from juice rubber plants with the addition of thickeners, pigments, plasticizers. They have excellent decorative properties. After removing the solvent, an elastic, durable film remains on the surface.
This paint is abrasion-resistant, not afraid of water, and can be washed. It comes in matte, semi-matte and glossy. To obtain gloss or matte, special solvents are added to it in small quantities.
Before painting OSB facades, it is necessary to apply a latex primer. To obtain a high-quality surface, the requirements for slab preparation are increased. It must be cleaned of dust and dirt. Paint with rollers or a long-haired brush.
This is the most expensive, but most attractive option. Dense and durable latex coating reliably protects against impacts, scratches and natural factors, easily stretches with various deformations of the base.
Water-based paint is not used for OSB. For wood, water-dispersion paints described above are used.
How to paint an OSB board outside: painting technology
How to properly carry out exterior painting work on OSB facades:
- Preparation: cleaning from dust, dirt, oils and other contaminants. If washed, it must be dried.
- Priming the surface with primers corresponding to the type of paint. Filling with special products for OSB preparation for varnishing.
- Sanding the surface with wood sandpaper of the appropriate grain size.
- Dust removal of the surface after grinding.
- Painting with the first layer of paint and drying until completely dry.
- Sanding the first layer to remove dust.
- Painting with a second coat of paint.
It is recommended to apply the coloring composition 2 times, although 3-4 stainings are often necessary. This is due not only to the protection of OSB from external factors, but also to aesthetics. Large chips of material shine through a thin layer of paint, negatively affecting appearance facade. It is important that each subsequent layer is applied only after the previous one has completely dried.
Different methods of decorative OSB coating - video
You can refine an OSB board or give it an antique effect using wood paints and varnishes.
It is necessary to paint OSB with overlapping layers, regardless of what you paint with - a roller or a brush.
Primers may only be used for paints as specified by the manufacturer.
White spirit is used as a solvent for alkyd paints. Turpentine, refined gasoline, RS-2, solvent, and xylene are also allowed.
Solvents for acrylic paints does not exist: they are diluted with water. To give acrylic paints a matte or glossy surface, special compounds called solvents are added. To remove dried paint, proprietary remover solutions are used.
For oil paints There are thinners that include: turpentine, white spirit, pinene, linseed oil.
Latex paints are diluted with water. It also washes off residues from brushes and rollers.
Sand the surface with sandpaper with a grit of 180-240. The OSB board is already sanded and its surface is ready for painting. Using coarse abrasives may result in scratches.
Painting OSB is associated with some difficulties, which, if not taken seriously, can lead to deformation of the material and uneven coating. From this guide you learned what paint is recommended for OSB boards and how to paint them if they are located outside the room
Regardless of the nature of the structure and the method of use for exterior finishing, builders are faced with the question of how to paint the OSB board on the facade. Most publications devoted to this topic consider a list of types of paints used for these purposes. However, it is quite difficult to call this information comprehensive for a novice master. We invite you to familiarize yourself with the secrets of professional builders who use this material as a basis for decorative finishing. How you can paint, taking into account different professional approaches, read below.
OSB for facade finishing - application features
Oriented particle boards are widely used in frame housing construction and as formwork for SIP panels. The advantages of this base include moisture and weather resistance (especially OSB-4), ease of installation and a perfectly flat surface.
Some designers skillfully take advantage of the original wooden structure, but this design, using OSB boards indoors for finishing, is intended for an amateur. This option impresses with its manufacturability, ease of installation, low cost, and, of course, original appearance. Can the same be said for use as a façade material?
With the exterior, everything is a little more complicated. The simplest option for aesthetic wall decor is to apply a thin layer of plaster and then paint. At the same time, the obvious redundancy of additional costs makes us think about options for conventional coloring. Manufacturers offer many non-specialized coatings. They do not always provide budget cost, low labor intensity and excellent appearance of the facade wall.
As a rule, painted without some additions OSB facades in appearance they do not reach a solid “four”. Features of the choice include such characteristics as resistance to UV radiation, precipitation, vapor permeability, and the ability to self-clean is also important.
To the advantages OSB applications on the facades include:
- ideal flat surface that does not require additional leveling;
- good adhesion with all coatings;
- exceptional weather resistance;
- the possibility of laying any insulation under the OSB board;
- low labor intensity.
Flaws:
- the presence of numerous seams that make finishing difficult and make the wall less aesthetically pleasing.
DSP as an alternative for facades
Please note the existence of the DSP - cement bonded particle board. It is made from Portland cement (65%), shavings (24%), and fillers that improve moisture resistance ( liquid glass, 2.5%), water (8.5%). The facade material It is characterized by phenomenal hygroscopicity. When kept in water for a long time, its dimensions change by no more than 2 mm. It insulates the building well, is resistant to mechanical stress, has sufficient vapor permeability, and is not affected by mold. The most important advantage is that it is completely ready for painting. Paint and varnish products are usually used for concrete structures.
Coating requirements
Before choosing a coating, you need to determine the requirements for the particular application. You can do this performance analysis yourself. Readers may also refer to manufacturers' recommendations. Companies are thinking through all sorts of operating conditions, analyzing the question in different contexts of how to paint an OSB board on the facade of a standard frame house.
For decorative finishing of the external walls of an OSB house, you need to choose paint according to the following characteristics:
- moisture resistance or complete hygroscopicity - the coating must repel water;
- vapor permeability, which will ensure the dryness of the room, as well as protection from mold;
- UV resistance – for color fastness;
- heat and frost resistance (range -35 – + 40 C);
- service life more than 10 years;
- resistant to fungal attack;
- environmental cleanliness;
- good coverage, thin layers - ensuring low consumption (latex);
- elasticity;
- abrasion resistance;
- self-cleaning;
- quick drying up to 12 hours (latex);
- protective properties for walls.
OSB is made from natural wood raw materials, for this reason it is worth choosing specialized products specifically designed for these purposes. The assortment is represented by Swedish and Finnish brands; you can find both tinted compositions and products with classic color. A good example is "Swedish red", a special shade often used by owners of traditional Scandinavian houses to paint the facade.
Finishing, seam sealing
A special problem, due to which it is customary to cover OSB facades with a thin layer of plaster, is the seams. When installing the base, a gap of 3 mm is made between its individual pieces (for large areas - quantity * 3/4) so that the OSB boards have an expansion range.
The seams are sealed with elastic compounds that compress under the influence of atmospheric changes without cracking. The following products are used for these purposes:
- silicone-acrylic sealants;
- Super-elast Polimin P-25;
- Tikkurila Presto LV;
- FIBRELASTIC SEMIN (especially for OSB).
When sealing seams, serpyanka is used for reliability, then the textured transitions are made invisible with putty.
Paint and varnish compositions and manufacturers' proposals
Paint wood materials can be done in a variety of ways to provide adequate protection. Judging by the manufacturers' proposals, best quality Coatings are guaranteed precisely by mixed compositions, for example, oil acrylates. They combine the qualities of certain substances. When staining, covering antiseptics can also be used. Please note that OSB is moisture resistant and has low vapor permeability and is not affected by fungus.
The use of paints and varnishes when painting OSB
The most suitable ones for painting OSB boards well are solvent-soluble dyes. Their composition is ideal and they form a single structure, bonding with the wax of the slab, consisting of polymers and resins. When choosing a coloring composition, preference is also given to water-dispersed and acrylic products.
Table 1. Types of paint and varnish products - application for OSB staining slabs
Process Features |
||
Organosoluble dyes | (wide range of colors, soluble in oil, alkyd, acrylic, water-dispersion compositions) | Acquire antiseptic properties when adding Aquastop |
Oily | Apply (service life up to 5 years, high cost). Form a water- and vapor-proof surface | Apply by brush, roller or spray |
Alkyd | Apply moisture-resistant, UV-resistant, does not respond to temperature changes. | Apply only to a perfectly dry surface, otherwise bubbling may occur. |
Acrylic, water-dispersed | Often used (eco-friendly, water-resistant, heat-resistant, provide UV protection, fire-resistant) | Apply during the warm season to avoid swelling due to water content. |
Latex | Often used (elastic, moisture-resistant, do not wear out, environmentally friendly, service life up to 20 years) | Wide range of colors, creates a slightly transparent coating. |
Manufacturers' offers
- Kolorit Econom Facade latex paint for wooden facades on acrylic base. Provides a slightly glossy finish. Painting latex paints OSB boards on indoor walls are made using Kolorit History. Includes an anti-mold component.
- If it is necessary to hide the texture, Tikkurila Valtti Color Satin is used.
- For forest cottages, use fire retardants from Vuprotek.
- Tikkurila Punamaali deep matte, Swedish red color (natural ocher) on an acrylic-oil base with the addition of solvent-soluble dyes for rough wood (economical consumption of 1 liter per 7-9 m2).
- Tikkurila Pika-Techo with a rich palette, acrylic-oil (economical consumption of 1 liter per 7-9 m2), low frost resistance.
- Rust-oleum Chalkboard – on a slate base, allows you to draw with crayons and erase the image without damaging the coating;
- Decorative version with CeboStone quartz filler, tinted in any color, matte, provides a “rustic” texture - a beautiful rough surface without applying a layer of putty.
- StoLotusan Color with the property of self-cleaning after rain.
- A budget option is Tikkurila VINHA covering antiseptic, ideal for half-timbered houses.
- Specialized covering primer Holzer OSB GRUND, specially developed for the wood-based base, can be tinted, does not show through the texture, is extremely frost-resistant, drying time is 6 hours, there is a “children’s” certificate.
All of the products listed are suitable for painting the walls of facades and rooms. From the list above, it is quite easy to choose what to paint the OSB board inside the house to avoid unnecessary purchase of material. When choosing a product for decorating wooden facades, take into account the operating features.
Application Features
Before painting a facade made of OSB boards, we recommend that you familiarize yourself with the application experience:
- Problems often arise with painting (paint falls off in flakes) due to the synthetic wax material used in production. Special primers (Aqua Filler) are used to improve the adhesion of paint microparticles.
- When choosing non-specialized acrylic paints, destruction of the painted layer more often occurs on the leeward side; for this reason, the compositions are “strengthened” with an oil component or covered in several layers. The façade should be painted in calm weather.
- Without soil water-based paint the slabs do not adhere to OSB - it is recommended to cover them with primer immediately after construction, and paint them after a few months (adhesion will improve significantly).
- Before painting, surface preparation is required; it is better to do this with a grinder, brush attachment or sandpaper.
As a result, we can conclude that specialized products for OSB boards are the most predictable in operation. Otherwise, you need to use specialized primers, as well as increase the number of paint layers, choosing products based on composition.
Today, such a popular building material as OSB is very attractive - it is inexpensive and easy to use. The durable slab can be used both indoors and outdoors. With the right paint, you can paint your OSB panels and add your own personal touch. This is why painting OSB boards indoors is so important.
The simple appearance of OSB board can give you a fresh boost with a touch of color. This wood building material is good as wall or flooring and he becomes interesting element design of your home.
When painting this material, there are a few things to know. You can treat OSB with appropriate paint to get natural look sheet - with a wooden shade, or use opaque paint - here you get a classic wall color. Even the industry is keeping up with the trends in painting OSB panels and has already developed special colors and materials.
External OSB panels come already coated, and they already have wood protection from weather conditions. Such panels, as a rule, cannot be painted, since sanding the surface will destroy the coating. At the same time, unpainted panels are used for indoors, which are very suitable for applying paint.
Choose unpainted material when purchasing OSB boards. On the other hand, it will be difficult to make the color and protection better than what is done in the factory. If you want, you can paint such OSB panels yourself desired color or with the desired effect, you will have to sand the surface - and this will damage the factory paint layer.
Once the untreated OSB boards are in your home, they are sanded and primed for paint. However, before you begin sanding and priming, you will need to give the panels approximately 48 hours to acclimatize. At the same time, humidity and temperature are formed in the material environment. It is also important that the sheets are at a short distance from each other. To do this, you can place small slats of wood between the individual sheets.
You will need:
- OSB panels without factory coating
- Sandpaper
- Primer
- small slats for storing OSB
- OSB paint
Painting OSB boards indoors - the need for priming
The primer protects the surface from absorbing moisture - so it is a necessary protective layer. OSB panels are a wood product and have the same typical properties. With high humidity and without proper protection, they lose their strength and shape - the sheets can swell, begin to rot, etc. Thus, primer is necessary for the quality and service life of OSB panels.
Advice: when purchasing, choose unpainted OSB sheets. And immediately buy the primer in the required quantity.
Choice of color and type of paint
The choice of color and type of paint depends on the location where OSB panels are used. Outdoor flooring, for example, requires a varnish that will protect the surface well. Varnish on water based, less suitable for painting, since the material can be deformed when exposed to moisture. There are paints and varnishes that can even completely seal OSB panels.
When the primer has dried, you can apply the first coat of paint. The first coat of primer may highlight strong smell. However, if you apply a second coat immediately after drying, the intensity of the odor will decrease.
When applying the primer, you can use a roller or brush, depending on your preference, or spraying is also possible.
Note: When painting indoors, always ensure good ventilation. This way the smell of paint will quickly disappear and be less harmful to health. If possible, move the work outside, but avoid direct sun rays onto painted panels.
You can also stain OSB
Staining has additional benefits compared to painting OSB panels. On the one hand, the market offers wide choose different wood tones, so you can get interesting results.
Wood stains are typically sold in liquid form and in many natural wood tones. This material is immediately ready for use and can be applied immediately. The stain treatment usually leaves a very good harmonious coloration on the material and can be perfectly integrated into the living room. In addition, the structure of the OSB board remains visible after this treatment. Each chip accepts color pigments differently, making the end result very attractive.
Also, when treating the surface with stain, the panel must first be sanded with sandpaper. Carefully remove any remaining dust with a brush. You can go over it several times with coarse sandpaper to achieve a darker color tone. Finally, after drying, the surface should be treated with varnish to protect the surface.
- Wood stains are available in many shades
- Sold in liquid form and ready to use immediately
- Repeating OSB surface provides darker tonality
- Can be used for both interior and exterior work
- The final layer of varnish protects the surface from moisture and damage
Tip: create a test pattern before staining the surface, apply all the planned layers. This way you can see the final result and possibly change the shade.
Using varnish in combination with stain
Varnish also ensures that the color is more intense. Commercially available one-component clear nail polish fits very well here. You have the choice between silky, matte or high-gloss finishes.
A high gloss varnish is required for an even application. The application process is very easy if you apply the varnish using synthetic fiber, resistant to solvents. This way you can be sure that the varnish is applied evenly and creates a beautiful surface. But be careful with the glossy surface! It has disadvantages depending on its use. If the surface is used, for example, as a floor covering or tabletop, scratches easily form after just a short time of use. A silky-matte surface, on the contrary, looks more natural and rich.
When applying paint, allow a drying time of approximately 12 hours per coat. Carry out such work in spring or early summer, since good ventilation promotes drying.
Results:
- Always apply varnish in thin layers
- Choose high quality brushes that won't shed hair during application.
So, painting an OSB board indoors is not a very complicated process, we hope you can do it yourself with our recommendations.
Painting OSB boards - video.
Among the variety of materials for constructing a finished floor in rooms for a wide variety of purposes, wooden solid board and parquet made from hardwood occupy a special position, associated with natural warmth, unique beauty, solidity and respectability. Wooden floors, despite high cost and the need for periodic maintenance remain in demand among a wide range of developers. But a tree that gives warmth and comfort needs good protection in order to faithfully serve several generations of its owners. For good protection, appropriate materials are required, so the question of which floor varnish is better and more durable will definitely arise before every owner who decides to make wood floors in their home.
What is floor varnish?
Floor varnish is a special mixture of various film-forming substances based on organic solvents or aqueous dispersion, with the addition of various additives that affect the characteristics of the product after its final drying. A varnish of different composition can have completely different characteristics, maximally adapted to protect the wood of different species from which elements can be made wooden floor. Oil, alkyd, acrylic, polyurethane, epoxy and some other varnishes allow you to choose exactly the composition that best copes with protecting wood from any influences and can change its appearance, which is sometimes necessary to solve complex design problems.
Any varnish consists of a certain type of resin dissolved in special solvent to a plastically fluid state, convenient for application to the surface of the wood it is intended to protect. After application, a durable film is formed on the varnished surface, protecting the wood from fungus, mold, moisture and mechanical damage.
To ensure long-lasting protection, the floor varnish must have the following properties:
- high strength and wear resistance of the film formed;
- the presence of a large amount of dry residue;
- maximum adhesion to wooden surfaces;
- low emission of harmful substances;
- resistance to chemicals contained in cleaning products;
- resistance to resin secretions of pine and larch;
- the ability to hide mechanical and aesthetic defects of a wooden floor;
Choosing the composition of the varnish
What compositions have chemist-technologists come up with to combine sometimes contradictory requirements in floor varnish. Based on organic solvents, emitting many harmful substances in a liquid state or water-soluble - environmentally friendly and practically odorless, drying when normal conditions or requiring elevated temperatures, creating a protective film as the solvent evaporates, or polymerizing after the introduction of a hardener.
How can a consumer choose the “right” varnish for a wooden floor, if there are only 7 types of main film-forming substances, not counting possible combinations of different components with each other to obtain certain properties. And these are only the main components, and there are more than 3 dozen hardeners, plasticizers and other additives. Which one is better to take for a specific type of wood, if some cover hard woods such as oak and larch well and are completely unsuitable for processing pine with a large amount of resin? Let's try to understand all this diversity and choose the varnish that is most suitable for a specific type of wood and specific operating conditions.
Oil varnishes
Oil varnish prepared on linseed oil with the addition of natural copal tree resin and diluted with turpentine with the addition of several components. Originally intended for varnishing floors, furniture and all kinds of external wooden products, creating an elastic and durable film, penetrating deeply into the wood fibers. Perfectly suitable for larch or pine floors, when the elastic film of varnish does not collapse on the wood of this species even under the influence of the resin present in it. Not suitable for OSB processing slab used to construct the subfloor.
Lack of oil varnishes– a complex and lengthy varnishing process. It is necessary to additionally take primer, strongly diluted with a solvent, dry for 4-6 hours, then apply the first layer of varnish and, after curing for 12-16 hours, sand it with a fine abrasive. Only then can the surface be coated with a base layer of varnish.
Varnishing is done using a brush, but it is better to take a special swab made of soft wool fabric, wrapped in a linen napkin and rub the composition into the surface to be varnished in a circular motion. Final drying occurs after 48-72 hours. But over the next 50 years, nothing will happen to either the varnish or the wood. All of the above applies only to natural oil varnish, which has nothing in common with its artificial counterpart.
Turpentine varnishes
A cousin of oil varnishes - a composition similar in the manufacturing process, but with different properties. A very elastic film is formed on the surface of wood treated with turpentine varnish. This is where the advantages end and the disadvantages begin. The film is very hygroscopic and does not withstand exposure to moisture, and increased elasticity reduces strength and wear resistance. On the floor, such a coating will last for several months at most, so it is better not to use these materials to protect wooden floors.
Alcohol varnishes
Made by dissolving natural resins in required quantity ethyl or methyl alcohol. The resulting solution can be tinted with various natural pigments to give required color. If necessary, to improve the shine, a special mastic is added to the alcohol varnish, softening the film and increasing the shine of the finished coating.
It is rarely used for varnishing wooden floors, due to poor protection from dampness and temperature changes, and even the high strength of the dry varnish film does not compensate for this disadvantage. Alcohol varnish does not combine well with oak and larch wood, which are saturated with natural tannins and resins. You can cover various types of fruit trees, OSB boards and other board materials. Does not give a strong odor, which disappears as the alcohol evaporates.
Alkyd varnishes
Alkyd varnishes are made on the basis of glypthal or pentaphthalic resins dissolved in organic solvents. They form a hard, moisture-resistant film on the surface to be painted. High adhesion to most types of surfaces and high film hardness limit the use of alkyd varnishes for treating wooden floors, the boards of which, under the influence of external factors, are able to “breathe”, changing their properties. linear dimensions. Surfaces coated with alkyd varnish take a very long time to dry, the second layer can be applied after 36 hours, and become a source of a strong pungent odor, so for varnishing floorboards it is better to choose a different composition, but for glue-impregnated OSB it is excellent.
Urethane varnishes
Urethane, alkyd-urethane and polyurethane varnishes form on the surface of any wooden product very strong wear-resistant films. OSB, softwood and hardwood can be coated with urethane varnishes.
If you take pure urethane varnish, then it has average wear resistance, which was sacrificed to increase the elasticity of the film, allowing the floorboards to withstand frequent and sudden changes in temperature and humidity. Elasticity with medium strength, ideal for soft woods.
The addition of alkyd resins to the urethane base composition adds some strength and makes it possible to cover oak and larch floors, parquet and musical instruments.
The best material from the urethane group intended for processing wooden floors is polyurethane. Due to its properties, a varnish based on it is better suited than others for protecting parquet and plank floors made from a wide variety of wood species. You can take the surface of any wooden product, planed board or OSB coated with polyurethane varnish and expose it to water, temperature and sunlight. Polyurethane will withstand all tests with honor.
Water-based polyurethane varnishes occupy a special place among the materials in this group. Excellent for processing subfloors made of OSB, planks and parquet made of larch, oak and many other types of wood. The somewhat lower strength compared to organic-based urethane materials is compensated by high environmental friendliness and complete absence of odor.
Acrylic varnishes
paints and varnishes based on polymethyl methacrylate resins, they have average resistance to impacts and abrasive loads, but are highly environmentally friendly as aqueous acrylic suspensions and are highly resistant to water and many solvents. These varnishes can be used for processing OSB boards, plank floors made of larch and other types of wood, installed in the bedroom and children's room, where the load is light and the requirements for the microclimate are very high.
Epoxy varnishes
These two-component materials are acid-curing compounds, which leaves a certain imprint on the features of working with them. High toxicity implies the presence of protective equipment. The process of releasing harmful substances continues for 3-4 days, but then the material becomes durable and chemically inert, not afraid of direct exposure to water. A significant disadvantage is increased fragility. It is good to coat the OSB board with epoxy varnish, where it hides possible irregularities and adheres firmly to the impregnating glue.