In order to prevent the plaster from falling off the ceiling, the wallpaper from peeling off and the tiles to hold firmly in place, a special product has been developed - “Betonokontakt”, another name is “Concrete-contact”. The article describes the features of this type of primer, the rules for selection and application.
High-quality interior decoration is characterized not only by neatness and aesthetics, but also by durability. The panel houses in which the majority of the townspeople live are structures made of reinforced concrete slabs. Therefore, when starting to renovate their apartment, people most often deal with the smooth concrete surfaces of these slabs, be it the ceiling, walls or floors. It is quite difficult to securely attach any finishing materials to them.
How can I dilute the primer?
Even before opening the container, you should decide how to dilute the primer, according to GOST 25129-82 - solvent, xylene or their mixtures with white spirit in a percentage ratio of 1:1 are considered suitable. The proportion of solvents should not exceed 20% (in the most extreme case - 25, and then only for a quickly hardening variety).
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Concrete contact for liquid wallpaper
Liquid wallpaper is a popular final finishing material, the advantages of which are:
- No joints;
- Elasticity;
- Simple and quick application;
- Affordable repairs.
However, applying liquid wallpaper without surface treatment to improve adhesion will not work, especially if the surface is smooth. An intermediate covering is required and concrete contact is a suitable option. It ensures adhesion of the finish to the wall, increasing its roughness due to quartz sand. This allows you to use liquid wallpaper as a finishing touch.
This is the only type of primer that can hold liquid wallpaper on a concrete or cement surface. The composition of Betonokontakt is a dispersed mixture, the base of which is acrylic. Quartz sand is also added to the mixture. Due to the components used, the primer gives off a pink color.
Recommendations
Most often, the types of concrete contact differ in the size of the grains of sand in the composition. The choice of the desired primer is made depending on the working surface. But otherwise the technical characteristics of the material are the same. The first thing you need to pay attention to when purchasing is the tightness of the container. This will guarantee the novelty and quality of the mixture. Obtaining the maximum effect is possible if you use concrete contact immediately after opening. If work with it is planned after some time, then opening the container is prohibited, and it must be stored in accordance with the manufacturer’s conditions. This way the mixture will not lose its properties and will not dry out. However, it is better to use the primer within 1 year from the date of production.
When starting to work with concrete contact, follow the recommendations:
- You cannot plaster with a cement mixture over concrete contact - only over the concrete itself. The strength of the material does not meet the standard indicators for covering with cement mortar.
- It is better to carry out work in a room with air humidity of no more than 70%.
- Pre-treatment of the base with a deep penetration primer will reduce the consumption of concrete contact and increase adhesion. However, several coats of primer may be required, depending on the substrate. This will additionally clean the surface and strengthen it (material consumption per square meter is about 300-400 g).
- Finishing can be done without special training and independently. The material does not require special knowledge or professional skills, however, if the work needs to be done quickly and efficiently, it is better to enlist support or turn to specialists.
Do you prime yourself or hire specialists?
Concrete contact under old wallpaper
During repairs, a situation may arise when there are several more layers of similar material under the old wallpaper. Many people don’t want to rip off each of the existing layers, but the question arises: is it possible to lay new material on old wallpaper, and what should the surface be treated with to improve its adhesion to the surface?
A suitable solution in such a situation would be Concrete Contact. It will ensure reliable fastening of the new material to the wall surface, despite the presence of additional layers of old wallpaper. Most experts recommend covering the walls with this type of primer before finishing the old wallpaper.
Compared to a conventional primer, concrete contact is considered an adhesive composition, due to which roughness appears on a smooth surface, providing high adhesive properties. This effect allows for the subsequent installation of many materials. A regular primer cannot provide a similar result, since it simply penetrates deep into the base.
Procedure for working with concrete contact
Before applying concrete contact to the surface, it is recommended to stir the primer composition to ensure uniform distribution of its components. If this is not done, the sand may settle at the bottom of the package, and thus the positive effect will not be achieved.
Before treating the surface of the base with a primer, it should be cleaned of dust and other contaminants so that the solution covers the entire available area. Concrete contact must be applied using a brush or roller. Also suitable devices for applying the solution are a spray gun and a plastering station.
The base is treated in two layers:
- The first is considered a safety net, and when applying it, Concrete Contact can be mixed with a regular deep penetration primer.
- The second layer is the main one. Only pure Betonokontakt solution is used.
It should be noted that applying the second layer becomes possible only after the first has dried. You can check that the layer is dry by touching it. If the primer stops sticking to your hands, then you can proceed to the second stage.
Application of this type of primer requires compliance with a certain temperature regime. It is important that the permissible temperature range is between +5 and +30 degrees Celsius. The use of Concrete Contact at subzero temperatures will affect its consistency, which will make it difficult to work with the material.
Questions and answers
Below are answers to frequently asked questions about the use of Concrete Contact during repair and finishing work.
Is it possible to glue vinyl wallpaper to concrete contact?
You cannot use such a primer for gluing vinyl wallpaper. Betonokontakt contains filler in the form of quartz sand. The use of the material makes the surface rough, and all artificially created irregularities will be noticeable if you glue wallpaper from a similar material.
You can use Betonokontakt only if you plan to treat the wall surface with putty before gluing vinyl wallpaper.
Concrete contact is mainly used on surfaces that are not capable of retaining intermediate layers of adhesive materials or a special leveling solution.
Using this type of primer, it is possible to perform tasks such as:
- Strengthening the structure before applying plaster to it.
- Laying tiles.
- Ensuring high-quality adhesion of decorative plaster or stucco molding to a smooth base.
- Preparation of metal products, as well as reinforced concrete elements for puttying.
- Strengthening the walls before finishing.
Among other things, concrete contact makes it possible to apply gypsum plasters on a cement base.
Is it possible to glue wallpaper directly to Betonokontakt?
It is not recommended to immediately glue wallpaper onto Betonokontakt. A layer of primer will create roughness on the wall or other surface. This will lead to the fact that the glue will not cope with its task, and after a short period of time, the wallpaper glued directly to the surface treated with Concrete Contact will fall off.
To prevent this, after applying the primer, you will need to let it dry, and then treat the wall with finishing putty. It will level the surface, which will allow you to glue the wallpaper without any problems.
Concrete contact is recommended for use when it comes to finishing slabs, liquid wallpaper or decorative plaster. The properties of the special primer ensure good adhesion of the listed materials to the base surface, which allows repair or finishing work to be completed efficiently and on time.
Specifications
The finished primer is a viscous liquid, usually pinkish in color. It has the following characteristics:
- Special adhesive additives in the concrete contact composition allow it to firmly bond even to the most problematic and dusty surfaces.
- Quartz sand increases the adhesion of the product to cement or wood, and also forms a rough layer with high adhesion on the treated surface.
- Biocidal additives prevent materials from being damaged by bacteria or mold.
- Durability of the composition. According to manufacturers, primer applied to various substrates can retain its properties for several decades.
- Waterproof. Can perform the function of waterproofing.
Why do you choose Betonokontakt?
Changing characteristics include soil consumption and the rate of drying. The first indicator depends on the type of primer and the characteristics of the surface on which it is applied. Concrete contact consumption per 1 m2 ranges from 200 to 400 grams. The answer to the question of how long it takes Concrete Contact to dry depends on the temperature and humidity conditions in the room (on average 3-4 hours).
Features of concrete walls
Speaking about the features of concrete walls, let’s remember what kind of houses are built from concrete. These are panel and skyscrapers. If your house is made of panels, then the walls are made of concrete.
Walls made of this material have the following features:
- Concrete walls are dark or light gray in color. It will appear on the wallpaper if you do not finish the wall surface.
- They have irregularities. Although they are invisible at first glance, they will be very clearly visible on the wallpaper.
- Concrete walls have a grainy consistency, which will also be very visible on the wallpaper.
To avoid this, the walls must be treated with primer and putty.
Is it necessary to cover the walls with Concrete Contact before plastering?
Use concrete contact with cement plaster
or tile adhesive in most cases is not possible.
... The mixture will break the film created by the primer, the wall
will become covered with cracks, the plaster will begin to peel off, and the tiles may fall off. Typically, concrete-contact primers also have a higher price.
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Why do you need “Betonokontakt”?
To improve the “adhesion” of the concrete base to plaster, putty, wallpaper, paint, tiles or other materials, a special type of primer called “Concrete Contact” is used. The specificity of this product is due to its composition, which usually includes:
- polymer base;
- quartz sand;
- cement;
- various additives (including biocides).
When applying the Betonokontakt primer, the following happens - on the one hand, the composition firmly “eats” into the base, and on the other, it creates a rough layer on the surface to which any type of finishing materials is securely attached. The use of concrete contact significantly increases the adhesive properties of the walls, their ability to form a strong connection with the next layer of finishing.
The “Concrete Contact” primer is used not only for working with concrete, but also in other cases when the base is too smooth and unreliable to cover with other materials (old paint, tiles, wood, glass or metal). However, manufacturers are not responsible for the effectiveness of such use of a primer, so when choosing, you should carefully read the packaging to ensure that the purpose of the product matches your goals.
Concrete contact is widely used for a variety of finishing works; it is applied:
- before covering with plaster or putty, to prevent crumbling;
- before painting, wallpapering or laying tiles;
- to reduce the formation of dust and dirt.
Concrete contact consumption
Material consumption is considered a fairly popular and important issue. Builders and specialists involved in renovation or finishing work must take into account how much material will be needed to fill the required area. This will allow you to calculate possible costs in advance.
As for the consumption of Concrete Contact, it is impossible to obtain an exact number by calculation. Its amount depends on the characteristics of the base, as well as other factors that cannot be ignored.
So, for example, for smooth surfaces the consumption will be less than for rough ones. Often, 1 square meter of base requires 200-300 grams of solution, but these figures will need to be clarified in any case. It is worth noting that when using special devices for applying concrete contact (for example, a spray gun), the material consumption will increase.
