Deep penetration primers for concrete: application features

Any finishing work begins with a primer. Each material requires its own coating, thanks to which further work will be successful. For concrete, special deep penetration primers are produced, which have specific application.

Features and purpose

Any surfaces, no matter how strong they are, need to be repaired from time to time, since the internal structure collapses, which also deteriorates the appearance. Deep penetration coatings can prevent this and increase surface life.

Deep penetration primer can be used for exterior and interior work. It improves the technical parameters of surfaces. A primer is necessary for various surfaces: aerated concrete, reinforced concrete, aerated concrete and concrete slab.

Thanks to the use of a primer, the strength of the coating increases, and the necessary protection from moisture appears. After its use, plaster and other materials intended for further surface treatment lay well. And besides, any decorative coating will hold better and last longer..

Thanks to the primer, you can save on other materials. This is due to the fact that it is well absorbed inside, and the paint falls on the surface. Due to the primer, the putty is well applied to the surface, becoming more elastic.


The deep penetrating base is a water-borne formulation that includes a latex mixture and acrylic paint. The protective film that forms on the surface repels water, helps to survive frost and then thaw. An antifungal additive protects the concrete coating from mold and mildew. But at the same time the primer does not clog the pores of the walls, due to this, the air circulates normally.

Primers from different manufacturers have additional qualities and characteristics, but the essence remains the same – this is the base that protects and strengthens walls, floors and ceilings.


Several types of special primers are intended for concrete surfaces..

  • Acrylic. She belongs to the category of those that dry very quickly. The advantages include the fact that it does not have an unpleasant odor. It is better to treat the concrete floor and walls with such a primer..
  • Polystyrene. This type contains solvents with toxic constituents, therefore it is recommended to use it outdoors. Enclosed spaces are not suitable. Before applying the polystyrene primer, the surface must be plastered.
  • Polyvinyl acetate. Ideal for indoor work. Drying time is thirty minutes. Then you can paint with the appropriate paints.

Primers can also differ in their effect on the surface..

  • Penetrating with glue content. It penetrates deep enough into the base, thereby increasing strength. This is a very good option when you need to restore an old surface in order to give it a proper look later. Thanks to this composition, all small cracks will be filled, which will prevent further destruction. A deep penetrating primer can strengthen a porous surface, but not a loose one. Latex particles contribute to a strong film.
  • Adhesive. This variant differs in that it is capable of forming an impermeable film. This quality is indispensable when it is necessary to process an already painted surface in order to renew the walls. Then you can put cement mortar and apply fresh paint.

But it should always be borne in mind that after using a particular primer, it is necessary to apply compositions similar in the presence of components. Paint or putty must be compatible with the primer.

How to choose?

When you have to choose a suitable composition, you need to consider where the surface will be used and what properties it has. One of the important factors is the location of the work, since the primer can be used for both indoor and outdoor applications. If the room is characterized by high humidity, then the primer must also be properly protected. In addition, you need to pay attention to what finishing work will be done next..

It will be helpful to familiarize yourself with some of the manufacturers and their products, so that it is easier to navigate when choosing the right primer. Domestic products are on sale at a low price, and there are primers from foreign manufacturers, the price of which can be much higher.


For a fragile surface that needs deep processing, the Prospector primer is suitable. It will even out the surface and perfectly prepare it for the application of subsequent materials. This option is one of the cheapest.

Primer “Ceresin CT 17” well impregnates any concrete base. This is due to the smallest particles that can penetrate even very narrow pores, while steam and gas exchange is unimpeded, which gives the coating strength. This primer is available in two types. The first option is intended for work in warmer climates, where there are no low temperatures, and the second is recommended for use where severe frosts are possible, which implies a special treatment for concrete. In addition, there is a light tone in the composition of the solution, so the treated plane is clearly visible.

A wide range of work can be done with a polyurethane primer “Lacra”. With it, it will be possible to avoid the appearance of fungus and mold on the surface. The antiseptic additive included in this type of primer allows it to be used in rooms with high humidity. It is perfect for a bath, pool, bathroom, bathroom, loggia or veranda.

A solution that dries quickly and penetrates deeply is simply irreplaceable in some cases. The primer is very popular. “Knauf Tiefengrand”. If you have to make puttying, laying tiles, painting, gluing wallpaper, then this tool is ideal.

“Knauf Betokontakt” Is a polymer dispersion primer containing mostly quartz sand. It is ideal for working in rooms. With its help, it is good to handle walls and ceilings, and even in those cases where complex work is then planned. For example, applying decorative plaster or plaster stucco. It should be noted right away that this is an expensive coverage option..

If the adhesion characteristics are the most important in the work, then it is better to use an acrylic primer. “Beton-Contact”. After its application, the surface becomes rough, while plaster and adhesive composition well on it. Accordingly, all materials that are then attached to this surface also hold well. The same properties are possessed by such products as “Beton-Contact Lakra” and “Cerfecit CT19”.

How to apply correctly?

Experts recommend applying a deep penetration primer for concrete as follows:

  • the concrete surface must be absolutely dry and clean;
  • if there are cracks and irregularities on the wall, they must be eliminated;
  • the solution is prepared according to the instructions on the package, most often the dry mixture with water is diluted in proportions one to one;
  • the primer is spread over the surface with a roller or brush, it is better to handle large areas with a spray gun;
  • when using a composition with a pungent odor, it is recommended to protect the respiratory tract with a respirator.

If outdoor work is carried out, then you need to adhere to the temperature from +5 to +30.

Before continuing to decorate walls, ceilings or floors, you need to wait until the primer is completely dry.

Adhering to these simple rules and knowledge about what types of primers exist and how they are used, you can easily cope with repair work, in particular with applying a primer to a concrete surface..

For information on how to properly prime a concrete floor, see below..

About the author