Delicate facade plasters do not always have sufficient properties for reliable laying on a problem base. And even if the target surface is quite “friendly” to such a design, experienced finishers are advised to increase the reliability of the cladding by laying a preparatory coating. In this capacity, a quartz primer is optimal, acting on both the base and the finish layer from the back side.
Appointment of funds
This primer is also called concrete contact, which reflects its main function of providing adhesion to various substrates. The porous concrete surface just illustrates the problem of using plaster on such a basis. It is precisely on the tasks of providing a bond between the rough coating and the decorative layer that the primer with quartz filler is oriented, and both putty and putty can be used as a finishing material.tile adhesive with a low binding function. The same applies to the foundation. In addition to cement, lime, chipboard and gypsum surfaces are famous for poor adhesion. In addition, the base primer based on quartz not only increases the adhesion of materials, but also adds to the insulating function, which is especially important in relation to facades.
Quartz primer composition
The material has a water-dispersion origin, supplemented with fine crystalline sand. It is allowed to use colors and ready-made primer compositions, including latex and acrylic. Moisture resistance is provided by the presence of composite synthetic inclusions, and resins and emulsifiers are responsible for the function of the binder. In turn, the quartz sand for the primer gives the coating a sufficient degree of roughness, so that the decorative materials are held and cemented. Moreover, the sand used is fine and clean - before mixing it is subjected to multi-stage filtration. The result is a polymer composition with mineral additives and sand filler, which, if necessary, is modified.
Material performance
Each manufacturer has in its family several variations of compositions that determine the functional qualities of the product. Among the most common performance characteristics of a quartz primer are the following:
- Facilitation of the physical laying of decorative plasters due to plasticity.
- Increasing adhesive properties at the application site.
- Availability for tinting (changing shade).
- Environmental safety.
- Vapor permeability.
- Improve waterproofing.
- There is no risk of the draft base showing through the decorative coating, regardless of its light transmission.
- Weather resistance.
Preparatory work
Primer can only be applied to a dry, cleaned, dust-free and fat-free base. It should not have bituminous particles from the previous waterproofing and traces of limescale. All this can harm the positive qualities of the material. If a quartz primer is used for the walls outside, then possible chips must also be eliminated. Such a surface must be thoroughly cleaned with abrasive materials and only then coated with a primer. Special attention is paid to fragile areas of the surface. Probable spalls, areas affected by the fungus or cracks are cleaned with metal brushes and removed. Further, the resulting voids are completely sealed with a primer. In the case of deep cracks, jointing is carried out with the possibility of filling with cement mortar. If there are signs of serious biological damage by mold or moss, then it is necessary to treat the surface with a special fungicidal agent, and then apply the plaster mixture. Only after it hardens and strengthens in strength, you can proceed to the next stage.
Consumption andconditions for applying the solution
The product is available in plastic containers (jars and buckets) with an average volume of 5-10 liters. Before use, the primer is mixed directly in the factory container. It is a thick homogeneous liquid that does not require special preparation. It is desirable to store the mixture at a temperature of 5 to 35 ° C, using the original packaging with tightness. In terms of application, the recommended flow rate of quartz primer varies from 0.2 to 0.5 l/m2. The choice of volume will be determined, among other things, by the absorbency of the target substrate surface. It is desirable to apply the material in dry conditions, at a temperature range of 5 to 30 °C and a humidity coefficient of no more than 80%.
Laying the primer
The material is applied with a paint brush, and the execution technique should focus on one pass without repetition. The mass should be leveled in a neat thin layer, using a small spatula or trowel. Two limitations must also be taken into account. In such works, dilution of the composition with water and the use of a roller are not allowed, since it makes the structure loose. Typical instructions for laying a quartz primer note that it takes about 3-3.5 hours for the structure to completely crystallize. This time must be waited, and then the final stripping should be performed. Its purpose is not to polish the surface (on the contrary, it should be slightly rough), but to remove pronounced defects. They are easy to removemetal grater.
Places that are not included in the target work area should be cleaned before curing immediately after completion of work. Fresh primer washes off easily. By the way, in order not to have to perform unnecessary operations, it is recommended to seal the places along the edges of the working platform with masking tape. After laying the mixture, it is removed without problems, leaving a smooth contour of the primed area.
Popular Manufacturers
The composition is relatively new in the domestic market, and yet he managed to gain fame not only in the circles of finishers, but also among ordinary homeowners. Recommended manufacturers for this product include:
- "Blis-contact". Composition based on water dispersion with the addition of latex and acrylic. As noted in the reviews, the product is distinguished by weather resistance and decorative qualities. So, after drying, the applied layer acquires a soft pink hue, transferring the texture to the finish, if it has a sufficient light transmission index.
- Ceresite. One of the most famous companies in Russia specializing in the manufacture of building mixtures. The German company in this case offers a high-quality composition of CT-16, indicating the presence of additions in the form of copolymers and titanium dioxide. This modification expanded the scope of the Ceresit quartz primer, making it possible to lay it even on chipboards. On the other hand, CT-16 has one of the longest cure times -about 5-6 hours
- Caparol Sylitol-Minera. This primer uses a special type of binder - along with fine quartz sand, particles of liquid potassium glass are also added. As a result, this allows the mixture to be used not only as an adhesive primer, but also as a structural leveling putty for glazing surface preparation for painting.
Conclusion
According to professional plasterers, the fewer technological layers a facade finish has, the higher its reliability. Of course, this applies to cases where organically interacting substrates and coatings are used. Adhesion is one of the basic conditions for the formation of a reliable coupling between dissimilar materials. It is the completion of this function that justifies the inclusion of an additional layer in the form of a quartz primer on a water-dispersion basis. Will the presence of this layer in the coating structure interfere? The only technical and structural drawback from such an inclusion is associated with a thickening of the facing "pie", but in a situation with a facade, this factor is not decisive.
