When carrying out finishing work, it is very important to comply with the technology. According to general rules, a decorative coating is applied to the surface after the primer. This stage is very important, since the consumption and quality of laying of the finishing material depends on the correctness of its implementation. The best composition for surface preparation is polyurethane primer . Consider its features in detail.
Composition benefits
Polyurethane soil is considered a universal composition. It can be used to prepare substrates with different absorbency from a wide variety of materials. Polyurethane primer is perfect for concrete , metal, wood, etc.
The composition can be applied to a warm floor. Other primer mixes will not give the necessary adhesion to such a surface.
Polyurethane primer is equally effective for both indoor and outdoor use. Moreover, the consumption of the composition is minimal - in the range of 0.2-0.5 kg per square meter. m. It will depend on the depth of absorption. The consumption of most primers is about 0.8-1 kg per square meter. m
An important advantage is the durability of the coating. Restoration of the surface with polyurethane primer will be required soon. Composition provides reliable protection.
disadvantages
Polyurethane soil has several disadvantages. First of all, the coating dries for a long time, about 3-5 hours. For most primers, this period does not exceed 2 hours.
In addition, the cost of the polyurethane composition is quite high. However, experts say that saving on a primer is impractical. The cheaper the composition, the sooner it will need to be updated.
One-component mixtures
The primer contains polyurethane and various solvents. However, depending on the base material, its location (inside or outside the room), special components may be added to the mixture. Polyurethane primer can be one or two component.
The first consists of a basic substance and a solvent. Suitable one-component polyurethane primer for MDF , concrete walls, wooden surfaces. They effectively strengthen the bases, allow you to level it and increase adhesion to the finish.
Two component formulations
They are available in the form of 2 bottles. In the first is a polyurethane mixture, in the second - a hardener. The contents of the vials are mixed immediately before application to the surface. This composition is characterized by high strength. However, it is less viscous, since it contains a hardener.
One of the most common two-component compositions is the Elacor polyurethane primer. For concrete, this mixture is ideal. Especially often it is used to cover floors with high traffic.
If the mixture contains a zinc-filled component, it can be applied to metal surfaces. Such a composition will provide reliable protection against corrosion.
A two-component polyurethane primer for wood is rarely used.
In some rooms, priming is the only way to paint (for example, when finishing the floor of a workshop or garage). In these cases, it is recommended to use primer-enamel. It will strengthen the base and protect it from destruction.
Classification
Primer compositions are:
- Acrylic. They are usually single-component. Such primers are used primarily for the treatment of MDF and wooden surfaces. Due to their ductility, they penetrate deep into the material, fill the pores and level the base. These properties are especially important when applied to non-laminated MDF. Acrylic solutions are also effective in the treatment of concrete substrates indoors. An important advantage of the mixture is non-toxicity.
- Alkyd. These solutions are used in the exterior decoration of wood, MDF. Such compositions reliably protect the material from destruction. If it is necessary to emphasize the invoice of the basis, it is more expedient to use soil-enamel. It will become both a topcoat.
- Epoxy. Such mixtures are used primarily for the treatment of metal surfaces.
Selection recommendations
Despite the fact that polyurethane compounds are universal and can be used for processing almost any surface, it is necessary to consider:
- Surface location. The choice of composition is affected by the place where the base is located (outside or inside the room), what factors affect it (rain, wind, etc.), humidity level and temperature.
- Features of the surface material. It should be remembered that mixtures suitable for wood or MDF will not adhere well to the metal base.
- Environmental friendliness. For indoor decoration, it is necessary to purchase non-toxic mixtures. It is recommended to choose compositions of polyurethane with acrylic. These primers are perfect for treating concrete and wood surfaces. It is these materials that are most often used in the installation of walls and floors.
Instruments
The technology for treating substrates with polyurethane primers is almost the same as the technique used for other formulations. The difference is that the structure of such compositions is not suitable for application through a spray gun.
You can treat the surface with a polyurethane mixture:
- Rollers of different sizes. This tool allows you to quickly cover a large area.
- With a brush. They are recommended to be used as auxiliary tools. For example, you can not do without brushes when applying soil to hard-to-reach areas. Covering a large area will take a long time.
Surface preparation
The primer can be applied on an unpurified base. However, for better adhesion, the surface should:
- To clear the basis of dust and the remains of the previous covering.
- Rinse.
- Dry and degrease.
If there are large cracks on the surface, they should be repaired. Minor defects can be left as the mixture fills them.
Features of applying the composition
Using a roller, the solution should be distributed evenly over the surface.
The second layer is applied after the first has completely dried (after 3-5 hours).
It is recommended to work crosswise. This means that, if the first layer was applied vertically, then the second time the surface is covered with horizontal movements of the roller. This ensures uniform absorption of the composition into the surface.
The third layer is usually not applied. After the second layer has dried, the finish is started.
Polyurethane soil "Elakor"
This composition is available in different types. Some primers use unique components, which provides a solution to a wide range of finishing tasks.
For example, the polyurethane composition "Eco Soil" is used in the treatment of surfaces that are constantly in contact with drinking water and food products. "Lux primer" is used for surface finishing with transparent coatings. It does not turn yellow, resistant to direct rays.
Primers "Elacor" also vary depending on the required penetration depth. The deepest composition, for example, is used to treat porous surfaces: polymer-cement, magnesia concrete. In this case, the mixture can be applied to a wet (not wet) concrete surface. Base treatment can be carried out on the 10-12th day after pouring.
A polyurethane primer doubles the surface strength.