Primer ST-16 from the manufacturer "Ceresit" is quite popular today among consumers. Without it, decorative plastering of surfaces would have been impossible, and there is no need to talk about Venetian plaster. The primer described is used before applying a decorative coating. This material has the status of a leader in its segment. In its field, this primer has become almost standard.
Reviews of basic properties
Primer ST-16 is a water-dispersion composition that can be used with different types of coatings, among them:
- gypsum;
- concrete;
- plasterboard;
- cement;
- cement-lime;
- Chipboard plate.
When it comes to concrete, aerated concrete should also be included here. In conjunction with it, it is necessary to coordinate the coefficient of vapor barrier of the primer with this indicator, characteristic of vapor barrier of aerated concrete. This value for the primer should be no less. Otherwise, the vapor barrier system will be broken, moisture will penetrate through the joints of the concrete and the primer and accumulate on the surface. Subsequently, you may encounter dampening of the base and the appearance of fungus.
Primer ST-16, according to consumers, can increase the quality of adhesion of the base to the finishing material. The composition has moisture repellent characteristics. Consumers like that it is vapor permeable, which not every primer can boast of. The composition does not contain solvents, which indicates environmental friendliness. Buyers especially emphasize that you can use the mixture not only indoors, but also outdoors. The composition is ready to use immediately after purchase. According to home masters, it should only be stirred a little.
Specifications
Primer ST-16 is a water-dispersed mixture of acrylic polymers, to which pigments and minerals are added during mixing. The consistency of the composition is quite dense, it contains a certain amount of quartz chips, which provides roughness and increases the quality of adhesion. The density of the mixture is 1.58 kg / DM 3 . The primer can be used at temperatures ranging from +5 to +30 ° C, while the lower limit must be strictly observed.
When applied, the air humidity should not be higher than 80%. Drying time can be from 3 to 6 hours, which is true at optimal ambient temperature. About 0.2 L of primer may be needed per square meter, the final value may increase and depends on the absorbency.
Application features
Primer ST-16, the characteristics of which were mentioned above, should be used taking into account some nuances. The application of the mixture can be carried out before gluing the wallpaper or painting the walls. The composition allows to increase the roughness. Before use, the material is well mixed.
The consistency is not suitable for application by roller; only brushes should be used for this. The same circumstance also indicates that stainless steel elements should be used as fasteners. Primer consumption “Ceresite ST-16” per 1 m2 was mentioned above. However, this is not the only condition that the manufacturer sets for the consumer. Among other things, the composition is not recommended to be diluted with water.
In order to check the primer for quality, use a spatula edge along the outer layer. If no trace was left, then the work was carried out by technology. You can use a primer on any surface. Despite the fact that the cost of the material is quite high, it remains popular among consumers. It is sold in containers of 10 and 25 liters, which will be enough for 50 and 125 m 2, respectively.
Application area
The primer described above is used to treat various mineral substrates. You can use the composition before applying acrylic, mineral and silicone decorative plasters. Perfectly fit on the primer paint designed for exterior and interior use. It is possible to use the material not only on cement, lime-cement, concrete and gypsum plaster, but also on durable acrylic and oil coatings.
Primer ST-16, the application of which is described in the instructions, is also used in the installation of external thermal insulation systems. The composition is coated with a reinforced protective layer, on which different types of plasters are then applied.
Performance Reviews
The primer, according to consumers, can reduce the absorbency of the coating, strengthening them and preventing excessively quick drying of thin-layer mineral plasters. Surfaces, according to consumers, with a primer can be protected from atmospheric precipitation and moisture.
Decorative plasters fit perfectly on the formed layer, the primer itself increases the operational reliability of plasters and paints, preventing the color of the rough surface from showing through a thin layer of plaster. The primer has a white color that customers like, as well as the fact that it can be tinted using the manufacturer's color map.
Surface preparation
Primer ST-16, reviews of which are presented in the article and should help you make the right choice, is applied to the prepared surface. The base must be made dry and even, and also strong enough. The surface should be cleaned of contaminants in the form of lubricating oils, fats, bituminous mastics, dust and fragile coatings. The crumbling areas must be seized.
Areas affected by moss, fungus and algae must be cleaned with steel brushes and coated with a fungicide preparation from the same manufacturer. Flaws and cracks should be filled with “Ceresit CT 29” material, having done this three days before applying the primer. For repair, you can use other materials designed for this purpose. “Ceresite ST-16” is applied to the primer “Ceresite CT 17” when it comes to moisture-sensitive and highly absorbent substrates, among them:
- chipboard;
- drywall;
- gypsum plasters.
Conclusion
Quite often, “Ceresite ST-16” is applied on a primer ST-17, which allows to reduce the quality of hydrophobicity. The primer preparation layer is left to dry for at least 4 hours. Doors and windows, as well as other elements and adjacent surfaces that should not be processed, should be covered with masking tape.
Before use, the primer is well mixed, it is applied to the surface once with a brush. The primer is not applied by roller, it should not be diluted. It is important to use only stainless steel or steel tools that are not exposed to these processes. It can also be, for example, plastic.