Previously painted or cement walls are often a problem for plastering jobs. The qualities of such surfaces make the application of any decor problematic. But thanks to the appearance of various primers, this problem has been solved, these primers strengthen the connection with concrete walls.
There is very there are many options for the correct decoration of cement walls, among them there are quite old recipes and even serious options, among them there is even one in which, before plastering, the surface is pasted over with a fabric base using a polyvinyl acetate emulsion and after that decoration is made on the basis of the fabric.
But this is a very expensive and not an easy way.
Therefore, the concrete contact was invented.
Today, due to new compositions of concrete contact, many things can be fixed or applied to cement surfaces, even window glass.
The cement surface differs significantly from the brickwork or from the silicate block in the amount of hidden very fine dust and the absence of large pores.
Cement dust on the cement surface interferes with the normal wetting of the cement with the adhesive, and a porous surface is essential for good adhesion of the plaster layer.
Concrete contact characteristics:
The primer is absolutely safe for humans, but it is best to avoid getting this emulsion on open areas of the body ...
You can work with a primer in the same way as with reinforcing mortars. Every self-respecting manufacturer encloses a short instruction with a description of the application to its product.
This view primers are most often sold ready-made and before applying it, you must first clean the walls from dirt.
Sometimes powder compositions of concrete contact are used, they are used in cases where large volumes of priming are required.
The instructions indicate that the ready-made composition of the concrete contact can be stored without loss for almost a year, while dry mixes can be used after long-term storage.
As a rule, concrete contact soil is made on a water basis, and for this reason, during storage for a long time, some of the water may evaporate.
Before buying, it is best to open the lid of the can and inspect the surface of the contents.
In the event that there are traces of dried mass with cracks on the walls of the can, then it is not recommended to buy such a mass.
It is always necessary to check the suitability of the concrete contact according to the expiration date.
Before use concrete contact, it is necessary to mix the mixture well until a homogeneous consistency.
This solution may delaminate during storage, this will not be considered a marriage, so it can be used.
Concrete contact in its composition has various substances and these substances have different densities, therefore the heavier ones settle to the bottom of the container.
If you apply an unmixed primer to the surface of the wall, an uneven pattern may form and the adhesion to the cement base will be different, not reliable.
During preparation, the walls are checked with a spatula for delamination, dirt, deep cracks and oil stains.
Small cracks are not dangerous for the use of concrete contact, since it has an adhesive base in its composition, which allows the primer to strengthen the surface layer well.
To apply concrete contact, use a foam roller or a wide brush, and with both tools the mixture is applied evenly.
Usually the concrete contact is white, but the Knauf concrete contact is pink.
The primer resembles liquid sour cream in consistency, it is easily held on a brush or on a roller. Concrete contact is applied first with short vertical stripes, and then with horizontal stripes.
A favorable temperature for applying concrete contact is from plus five to plus thirty degrees. If the primer is applied at higher or lower temperatures, the drying of the primer will be uneven.
If concrete contact is applied at a strong negative temperature, it turns into a viscous mass that cannot be worked with.
Concrete contact layers dry out from two to four hours, but experts recommend starting plastering after two and a half hours.
When the primer is dry, do not use any technique indoors that may contribute to the formation of suspension or dust.
Excellent adhesion and high strength of the soil, designed to work with a cement surface, is becoming more in demand.
For example :
Concrete contact is produced in two versions - it is a composition for use under putty and for plaster. In the first composition, there is a fine filler and therefore it is laid down in a thinner layer. For the application of heavy plasters, it is necessary to use a concrete contact with coarse-grained fillers. In the event that the walls are dirty or have hydrophobic impregnations, then before applying the primer, the surfaces are treated with special compounds.
Most often, well-known manufacturers do not disclose the composition of additives that determine the properties or characteristics of a concrete contact.
Usually, all primers have a similar composition, but experience with soils, which were obtained by mixing concrete contacts from different manufacturers, has shown that the raw materials, and not their mixtures, have the best characteristics.
We hope you find this article useful. Good luck!
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