Primer for decorative plaster - varieties and features of application
Decorative surface finishing is a rather responsible method of wall finishes.
The quality of the application of such a mixture for plastering will depend not only on the appearance of the walls, but also on the consumption per square meter of the surface and the durability of applying the compositions on it.
In order to ensure the required quality of adhesion of the working solution to the base of the coating, before starting work, various types of primers should be used for decorative plaster, as well as the correct technologies for their practical use.
For a high-quality coating of wall surfaces with decorative plaster, the following is required:
- Carefully level the surfaces both vertically and horizontally.
- Application of finishing putty for filling all types of defects.
- Provide perfect adhesion of the decorative plaster layer to the base.
- Ensure the strength of the original surfaces, on which further work will be carried out.
To solve such problems, you should know what material the wall surface and what is their technical condition at the time of priming. For example, for continuous porous-type coatings (wood, concrete and brick) of interior surfaces, deep penetration primers should be used. It is they who will ensure the vapor permeability of the treated areas, and also excellent adhesion of the plaster to the base.
Moreover, primers with a deep degree of penetration often contain anti-rotting components that prevent the appearance of fungal colonies and mold, which are almost impossible to remove from the interior walls finished with decorative plaster.
In case the surfaces are loose, use primers with a strengthening effect. They will help to increase the density of the walls, and also, like primers with deep penetration, they will improve the adhesion performance. It is recommended to use such primers on lime plaster, because after several years of use it begins to destroy the initial surface of the walls.
Leveling surfaces before work is done in several ways, but the most practical, and still giving good results, will be the method of hanging.
The part of the walls to be decoratively plastering is marked diagonally by means of dowels, and then a measuring cord should be hired between them using a plumb line. By the sag of the cord, you can judge where and how to align the walls. The size of the gap before plastering can be partially eliminated by means of putty, and then the surface will be primed.Excess product can be knocked down with a chisel or scraper. At the same time, the consumption of the primer per square meter increases, but the need for more expensive decorative plaster will decrease.
It also happens that the gap is much larger and even more than 4-5 cm. In this case, leveling and further priming of the walls will not give the required result. There are two options for the development of events before processing:
By the way, the latter, although it will increase the bearing capacity of decorative plaster, is used much less often in practice.
The reason for this may be increased expenses, as well as the need to use steels that have an anti-corrosion coating or aluminum strips.
Compositions of primers for decorative plaster are classified:
- In terms of acidity, the pH is alkaline, acidic and neutral.
- According to the degree of increase in the adhesion of the primed surface.
- By the viscosity of the compositions.
- Where possible, work with some types of decorative plaster.
The first indicator is important for the ability of priming to hide, or vice versa, to highlight the characteristic surface flaws on the walls. These include rust stains and salt deposits, which very often appear after the lime-type treatment of external walls. With a large number of such surface flaws, only alkaline primers should be used in the work, the pH of which is the highest (from 8 or more units), and at the same time, the compositions have deep penetration. In this case, salt neutralization occurs during priming, as a result of which even very deep stains will disappear. The same will apply to surfaces of rust, and it aggressively affects the adhesion, because it destroys not only the surfaces of the walls, but also the primer, if it is not selected correctly.
Please note that a primer that has reduced pH values is suitable for treating interior wall surfaces in rooms with normal or even slightly reduced humidity levels. For such premises, the specific consumption of the primer per square meter is reduced.
After plastering work, any external and internal surfaces should be putty. The compositions of the putties are also selected according to the degree of relationship with the plaster compositions. A rather important parameter that determines the durability of the decorative type of plaster is the correspondence with the selected product.
Otherwise, after priming, partial or even complete flaking of the plaster composition may occur.Often not running into such a nuisance, you should exclude the use of putty, which contains substances with a high viscosity and have a slight degree of absorbency (for example, putties based on alabaster, adhesives, oil putties).
Features of priming wall surfaces under the application of a decorative type of plaster are as follows:
A similar operation is performed for external and internal walls. As a result, the layer will begin to thicken and provide an excellent base for decorative types of plasters in the future.
A primer for work before decorative plastering will provide the finish surface with the desired level of durability. Its consumption per square meter is 1/5 liter and depends on the materials of the walls, as well as the state of the original coating.
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