How and how to paint OSB panels correctly, compositions for interior and exterior work

Oriented strand board is sought after in construction due to the combination of good operational and technical properties and low cost. The material is considered a rough material that requires coating with a finishing compound, although with the help of high quality paint, OSB can be polished beyond recognition, used in part of a decor. The main thing is to choose a suitable paint, since not all compounds are on the surface of the material.

What is an OSB plate

OSB panels are made from large size wood chips (90%) and fasteners (10%). For gluing, formaldehyde resins or polyurethane adhesive are used. There are several types of materials in terms of strength and thickness, moisture resistance, environmental friendliness, presence or absence of spike joints.

According to the main technical indicators, YUSBI are divided into:

1. OSB-1 - fragile and moisture-unstable boards, which are used exclusively as a raw material. They are inexpensive, optimal for creating a temporary framework for pouring concrete.
2. OSB-2 is a fairly strong, but not moisture-resistant board, which is used only for sheathing interior walls and creating partitions in dry buildings.
3. OSB-3 is a versatile medium-grade material. It is used both outside and inside the premises: they close the walls, constitute a solid type box for certain types of roofing, as well as floors between floors, decking.
4. OSB-4 is a high quality material that is durable and moisture resistant. Versatile in application.

Tiles with dimensions of 125 × 250 cm and 122 × 244 cm are most often seen on sale, although other options are available, the choice of which allows you to avoid a large amount of scrap when covering a surface of a certain size. Thickness between 0.6 and 2.5 cm.

For painting, you should not buy OSB boards, in which pieces of bark are visible. Over time, they will peel off, spoiling the appearance of the painted surface.

OSB panels are divided into:

1. Regular ones with a straight edge. When covering them, they make loose seams, leave a distance of 3-5 mm so that the coating does not deform during temperature fluctuations. The plates are securely fastened with self-tapping screws, spaced 35-40 cm apart. If the panel is large, insert additional self-tapping screws diagonally.
2. Grooved with a spiked connection. They are used to create a topcoat for painting and varnishing. Tight seams are obtained, thanks to which it is almost impossible to see where one ends, the second sheet begins. To fix the OSB, a large number of self-tapping screws are not required. Additionally, tongue and groove panels are applicable to create a "floating" covering of a concrete surface.

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For interior decoration, you cannot buy OSB panels based on formaldehyde resins, as they emit toxic volatile compounds. This coating has a high formaldehyde emission class - E2.

For interior painting, boards marked "GREEN" and "ECO", made of wood impregnated with paraffin compounds, are optimal. Their adhesive base consists of safe polymerized polyurethane resins. The emission classes for residential premises are E0.5 and E1.

Requirements and criteria for choosing paint

Due to the peculiarities of the composition of OSB panels, not all coloring compositions fall on their surface. The material is saturated with resins, so its adhesive power is weak. OSB boards poorly absorb water-based paints and other water-soluble paints.

Acrylic and other polymer compositions are preferred for OSB painting. They adapt perfectly to irregular materials and offer good weather protection.

When choosing paint for OSB, consider the following criteria:

• the type of plate for the bonding component in the composition and the technical characteristics;
• method of additional coating and decoration (preserving an uneven surface or smoothing);
• painted surface (floor or wall covering);
• indicators of temperature and humidity in the room, degree of influence of ultraviolet radiation.

If you need a composition for external painting of OSB, then you need to take one that contains components that neutralize the effect of ultraviolet rays. Otherwise, the plaque will begin to peel off and repainting will soon be required. The composition for interior painting should be environmentally friendly, free from toxic components.

The hardest thing to paint is OSB that has been in the sun for a long time without a protective coating. Ultraviolet light and precipitation significantly reduce the quality of the material, it becomes difficult to apply even special paint for OSB panels to it. The material must be carefully cleaned, sanded, treated with an antiseptic.

Recommended formulas

Acrylic, alkyd, oil paints, as well as special compositions for OSB, called primer paints, are suitable for painting wood-based panels.

For interior work

For finishing inside the building, it is better to choose polyurethane, acrylic, epoxy paints, a mixture of stain and varnish, as well as a special composition for OSB.

Acrylic	optimal for painting walls and ceilings, forms a uniform and dense coating of a uniform color.
Polyurethane dye	It is used to paint rooms with high humidity, based on organic solvents, the paint, when combined with the resins that make up the slab, forms a high resistance and durable coating.
epoxy dye	the best option for creating a smooth floor covering, the technology of work is the same as when casting a three-dimensional polymer floor, while it is possible to give a certain color or preserve the natural pattern of wood .
Primer paint	has excellent adhesion, protects the panels from negative external factors, does not let moisture through, forms a dense and elastic layer, is available in white, suitable for tinting in any shade, is used both as a coating finishing and as a base for decoration.
Dye and varnish	It is used to emphasize the natural texture of the wood, the stain applied first gives the desired shade, and the vinyl or polyurethane varnish fixes the result.

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For outdoor work

For painting OSB panels located outside the building, oil, alkyd and acrylic compounds resistant to weather factors are used.

Coloring order

Since wood planks are textured, with an uneven surface, you need to use more paint than when coating similar smooth material. To make OSB panels uniform, they must be carefully prepared before painting: putty and primer.

Preparatory work

The quality of the paint depends on the thoroughness of the preparation of the plate. Prepare the OSB for painting before attaching it to the wall.

Follow this algorithm:

1. Sand the surface with sandpaper to hide the texture and also to remove the protective coating that prevents the paint from absorbing into the material. It is especially careful to grind OSB-3, since such boards are treated with a composition of varnish and wax.
2. Defects, panel joints and places where self-tapping screws are inserted, putty. Use an oil-based glue sealant. If the joints remain visible after the treatment, you can close them with molding strips.
3. Once the putty is dry, sand the slab with sandpaper so that the coating is perfectly even.

Primer

The next step is OSB booting. The most commonly used are acrylic and polyurethane varnishes. They are diluted with water in a ratio of 1:10, applied to the stove.

A good primer is an adhesive. Such a primer creates a reliable layer between the panel and the paint layer. An adhesion primer is optimal if oily wood chips were used in OSB production. The primer will prevent the wood oils from standing out.

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Alkyd varnish is also suitable for processing OSB boards. To dilute it, use white spirit or a similar solvent.

Dyeing

To successfully paint OSB, follow the following algorithm:

1. Paint over the edges of the panel. Paint the edges tightly, because here the dye is most actively absorbed by the material.
2. Roll the paint evenly over the surface to form a thin layer. Do not change the direction of movement.
3. Let the stove dry.
4. When the surface is completely dry, apply a second coat of stain. Roll your roller perpendicular to the previous direction.
5. Apply a third coat of paint if necessary.

Drying

The paint must dry well between the first and second coat. Dry the painted panel for about 8 hours in a room where there are no drafts and temperature fluctuations. After the painting is finished, the OSB is dried in the same room.

How to artificially age the material

For OSB, we can apply the aging effect, the surface is elegant and original. To age the material, patina paint and special varnishes for aging wood are used.The method is applicable to smooth visible protrusions without changes in texture.

To paint semi-antique OSB, it is necessary to take a grinder, a sanding sponge P320, a sanding wheel P180, an airbrush, a patina, acrylic and tinted varnishes, a primer.

To paint an aging OSB paint, do the following:

1. Sand with light pressure all around. Go through each section 3 times.
2. Prime the panel. Wait for the primer to dry.
3. Go around the surface again to make it dull and smooth.
4. Apply the acrylic varnish in several coats. Let dry.
5. Airbrush the patina. The spray should be even, without gaps. Let the baking sheet dry for 10 minutes.
6. Sand the surface with a sponge to reveal a crisp woodsy pattern.
7. Apply the tinted varnish of the desired color, let dry for a few hours.

Painting OSB is not difficult.The material is not too susceptible to the influence of external factors, therefore the use of serious protective compounds is not required. However, in order to obtain a high-quality and durable coating, it is necessary to choose the right paint, follow the preparation and painting technology.