Pre-treatment of surfaces before plastering is provided by building technology to improve adhesion of further wall coverings with other materials. The primer of the walls under the plaster prevents its subsequent cracking and peeling.
If the plastering technology is not followed, the end result is doomed to rework.
What is the purpose of priming surfaces?
The primer is necessary to improve the parameters of the walls before finishing work.
Primer coating allows you to:
- remove sand grains from the surface and plug small cracks;
- ensure uniform absorption of subsequent material;
- improve the adhesion of the base with further finishing;
- significantly save the plaster mixture;
- apply a modern product with antifungal properties;
- extend the service life of the finishing material several times.
When finishing, specialists use soil mixtures before each stage of work. Compliance with simple technological rules significantly affects the quality of the finish and increases the service life.
Which surfaces should be primed
A beautiful and even wall can be obtained using simple plaster. However, there are walls that are not ready for plastering, and the primer is the composition that should be used to treat surfaces.
If there are walls made of various materials and of different quality in the room, you will have to stock up on several types of primer material. So, you need to cover with a primer:
- strengthening - porous surfaces (concrete, brick);
- deeply penetrating - asbestos-cement walls and freshly plastered walls;
- anti-corrosion - metal structures;
- antiseptic - wooden surfaces;
- against stains - surfaces made of organic and inorganic material.
Choosing a primer for a specific base
Building practice confirms that in order to obtain a strong and durable finish, it is necessary to prime the walls before plastering.
The consumer building materials market offers a wide range of primer products, making it easier to choose for each substrate. Each package indicates the materials that need to be treated with this primer.
The constituent components of each mixture are: adhesive mass, resins, oils, coloring pigments, substances that accelerate hardening and drying. The composition of the soil depends on the adhesion to the surface for which the treatment is provided.
A primer with a mineral base should be impregnated with ordinary concrete and its analogues: foam-gas-slag-claydite concrete.
Acrylic primers attract with a wide range of applications and affordable price, which are well compatible with drywall, cement and concrete surfaces with synthetic paints.
In addition, alkyd compounds are a good impregnation for chipboard and fiberboard with a painted or untreated surface.
Enhanced properties of soils for special purposes (to retain moisture, prevent the formation of stains) are given by special additives that are introduced in certain proportions.
A primer with a high penetrating effect should be used on porous and loose substrates in order to significantly increase the strength of the layer. A high-quality penetrating liquid composition should be cloudy, but leave no traces, completely absorbed into the surface.
How to apply primer
In the production of finishing works, several methods of applying a primer before plastering are used, each of them has its own advantages.
The most common application method is rollerwhich saves material.
Brush (brush) used for processing bases that require a good layer of soil, and hard-to-reach surface areas.
Airbrush provides a quick primer, but you need to properly adjust the nozzle, otherwise there will be an overrun of the mixture.
The choice of method depends on the cultivated area.
About the features of interior decoration
High-quality interior finishing involves applying a primer to each layer of the treated area. So, the surface should be primed to plasters, then before putty, then before wallpapering.
Before applying the paint, it is necessary to apply an acrylic primer, and not an alkyd one, then the paint will be better (without bubbles) to lay down on the surface.
Long gone are the days when one type of primer was used for all types of finishing work. Today, the building consumer market is supplied with a wide range of modern primers in dry form and ready for use.
Briefly about the ratio "price-quality"
All primers supplied to the market are conventionally divided into 4 groups:
- inexpensive materials, more often used in the decoration of public spaces, when cost is more important than quality;
- high quality materials of a domestic manufacturer or jointly with foreign production;
- primers provided by well-known international companies (ATLAS, JOBI, DUFA, TIKKURILA, OPTIROC);
- elite imported materials supplied on order with additives that can be used to control the drying speed of the composition.
If finances allow, then it makes sense to use the primer composition of the second and third groups in various combinations.
