In the modern construction market, concrete contact is presented in a wide range. Each manufacturer makes its own changes to the recipe, which affects the characteristics of the material. Let's look at the main differences between soils from popular manufacturers. Let's get acquainted with the features of the composition and subtleties of application. After reading the article, when choosing a concrete contact or working tool, there will be fewer questions for consultants and craftsmen, and the final result will be better.
Original Betokontakt from Germany Source forum.saransk.ru
Specifications
Let's look at what concrete contact is and why it is needed. A popular primer is supplied by almost every manufacturer of paints and varnishes or leveling mixtures. The developers of the composition are recognized as German technologists from the family enterprise Feidal. In the original version, the pink liquid mass is represented by 40-50% solid/dry matter, the rest binding with functional additives.
The technical characteristics of concrete contact are determined by three groups of components:
- acrylic dispersion is responsible for adhesion indicators;
- quartz sand or analogues provide roughness;
- functional additives that give the coating water resistance, resistance to biological or corrosive damage.
Healthy soil has a neutral acidity level. This explains the absence of chemical reactions between the coating and any plaster/adhesive solutions based on a mineral binder, for which concrete contact is more often used.
Mechanical plastering of walls using concrete contact Source specteh-rzn.speczakaz.info
The consumption of primer material directly depends on the size of the solid filler. So, for the most part, the fraction of grains or crystals is 0.3-0.6 mm. The lower the indicator, the less composition will be needed to treat a given area. The dependence also lies in the processed base:
- high-density monolithic/slab concrete – from 350 grams per sq.m;
- tiles, porcelain stoneware – about 150-250 grams/sq.m;
- oil/alkyd paint with continuous coating – at least 200 grams.
To make it easier to monitor the solidity of the coating, manufacturers add pigment additives to the soil. Pink color predominates, blue is less common. The Tex company has found a more original solution - as the composition dries, it begins to turn red on the surface.
Storage rules for Betonokontakt
You can purchase Betonokontakt primer at almost any hardware store. At the same time, a wide range is presented to consumers.
"Betonokontakt", ready to use. Sold in plastic containers. Weight ranges from 5 to 40 kg. When choosing this option, you must remember that in an open container the solution may dry out and become unusable. Based on this, it is advisable to purchase several containers of small weight. If the composition from the container is not completely consumed, it is necessary to ensure maximum tightness. The approximate shelf life of the finished mixture is one year from the date of manufacture. The manufacturer must indicate this date on the packaging. During storage, it is also necessary to pay attention to the ambient temperature. It should be in the range from +5 to +30 degrees Celsius. The finished mixture is extremely unstable to freezing during storage. It can lead to a complete loss of material properties. Direct sunlight also has a detrimental effect on the finished Betonokontak.
The approximate shelf life of the finished mixture is one year.
There is also a “dry” version of the primer. It is also sold in buckets or bags with various packaging. This mixture is less susceptible to external influences. As for the cooking method, it is indicated directly on the packaging.
Purpose
The scope of application of the soil lies in the information about what it is - concrete contact. The acrylic binder has the ability to penetrate deeply. The composition forms a vapor-permeable rough film. Such properties are valued when working with substrates that do not absorb moisture and have a smooth surface. A common option of this type is concrete.
Smooth concrete floor Source yandex.net
The high adhesive ability of the soil ensures a strong connection of materials. To tear off the coating you will need to apply an average force of 100 g/sq.mm. This suggests that the base treated with concrete contact will be able to withstand a large layer of leveling plaster and cladding.
Among other things, due to the filler and the properties of the acrylic component, the dry residue can strengthen the base. The film has a high tensile strength. This is especially true when finishing an old base with microcracks.
As a result, the scope of application of concrete contact extends to the treatment of surfaces of the following nature:
- high-density concrete (panel houses, columns);
- ceramic tiles for finishing without dismantling the coating (two-layer application of primer is recommended);
- dry wooden base to be plastered (other compositions are not suitable);
- metal structures for any purpose without pre-treatment with an anti-corrosion compound;
- plastic or glass surface with correct calculation of the weight load of subsequent finishing.
Priming a painted surface Source snappygoat.com
See also: Catalog of companies that specialize in finishing materials.
Separately, a primer with sand is considered for suitability for brickwork. Not all manufacturers include such a base in their scope of application. The reason is the heterogeneity of ceramic blocks and grout. The latter refers to porous materials that are rarely permissible to be covered with concrete contact.
Acrylic-based compositions can be diluted with water if necessary (not recommended). After drying, the coating can be painted with dispersion paints. Often the surface is decorated using concrete contact. If the composition is not stirred until smooth, then using a brush you can form a chaotic pattern. This way, you don’t have to align the walls with the ceilings, but you can visually transform it for a long time, and additionally protect it from fungus, mold, and corrosion.
Often in the old foundation, finishers are faced with oil paint and chalk. Such finishing is subject to maximum elimination. Next, you should make notches under the plaster or cladding using an ax or a hammer with a chisel, and sand the surface with a coarse abrasive to create roughness.
Notches on a complex base Source couo.ru
After removing grease stains and dust, priming can be carried out, preferably in two layers with intermediate drying.
Among the recommendations you can find the use of contact concrete under putty. However, this material is intended for thin layer application and finishing. The sand contained in the soil will contribute to the formation of scratches and, in general, the composition will be a waste of time, effort, and money. For final leveling, it is enough to treat the base with a dust-removing agent for plaster, a highly specialized primer for metal, plastic, and glass.
Restrictions on use
Most manufacturers and consultants on trading platforms position concrete contact as a universal material. This applies to any soil regarding the nature of the finish with the base, but not suitability for work indoors and outdoors. Samples applicable in both directions exist, but their number is limited. In fact, some soils cannot be used for treating the facade, roof, or basement.
Primer for interior work Source stpulscen.ru
Some options are only permissible for substrates in dry rooms. It is important to first read the instructions on the labels of the cans or buckets.
Due to the high strength of the film, soil is often used to strengthen a loose foundation, for which concrete contact is unsuitable. The composition will penetrate into pores and microcracks, but only superficially. As a result, the finish may fall off the wall or ceiling in a layer under its own weight. Here you need a special strengthening agent with deep penetration.
In order to enhance adhesion and reduce absorbency, any porous substrates must be treated. Soil with quartz sand is not suitable for this, since the binder component will mostly end up in the pores. As a result, the permeability of the breathable surface will decrease to an insignificant extent, and the bond between the filler grains will be insufficient to withstand the declared mechanical load. The solution here is an impregnating agent, which is applied in 2-4 layers with intermediate drying.
Porous materials Source prom.st
Kinds
Betonokontakt primer is available in two types:
- Acrylic (polymer). Used for facade, street and interior work. Panels treated with this primer provide indoor comfort.
- Water-dispersed. Suitable for working with drywall, monolithic concrete slabs, processing wooden and plastic structures. And also for impregnating plaster before gluing vinyl and paper wallpaper. Well emphasizes the structure of masonry and wood.
The primer also differs in:
- size of grains of quartz sand;
- purpose (external, internal work, combined).
Use the primer strictly for its intended purpose!
When taking into account the manufacturer's recommendations, the efficiency of working with the mixture increases significantly, and the primer consumption itself decreases.
Video description
From the video you can get acquainted with the features of various primers:
There are points for which concrete contact is needed, but with limitations. This applies to metal, wood, plastic and glass. The expected result will be obtained only on a mineral surface with the listed inclusions. For a solid base, the option of subsequent finishing with light weight using paints and varnishes would be relevant.
Experts note deviations from the expected when concrete contact is used under self-leveling floors. If you have to work with cement mortar, the adhesion is good, but gypsum does not spread. As a result, cracks and peeling of the coating appear.
Prohibitions on the use of Betonkontakt
It is not advisable to use a primer for:
- Impregnation of crumbling, loose, fragile base.
- Before laying a self-leveling floor or cement screed on a rough base.
- On a wall whitewashed with chalk or lime.
- On the base on which the tiles will be glued. Adhesion glue adheres to surfaces better. When Concrete Contact is also added, the tiles’ adhesion to the wall will be much worse.
We pre-treat a weakly absorbent smooth surface with an abrasive material to make it rough.
Errors at work
Due to inexperience or ignorance, building materials for intermediate installation are often used, making mistakes. The consequences of this can be unpredictable, and it is almost impossible to track the processes of destruction under finishing in a timely manner. This also applies to concrete contact.
Consequences of violating plastering technology Source kontrolstroy.ru
In reviews, there is often a remark about adhesives and leveling mixtures that they have poor adhesion to soil with quartz. This is only possible if the solution contains an excess amount of water. This drawback leads to the separation of mixtures due to a disrupted moisture transfer process and a low concentration of the binder component.
Deviations from the declared soil parameters may occur for the following reasons:
- applying the composition at temperatures below +7 – +10°C or above +25°C, at a relative air humidity above 65%;
- processing frozen or wet bases;
- finishing of an unprepared surface (dust, grease stains, affected areas, weak spots);
- inadequate drying of the coating (how long the concrete contact dries depends on the recipe, the original takes only 3-4 hours);
- wind or draft accelerates the process of water loss and the formation of dry residue, but disrupts its quality;
- adding water reduces the concentration of the binder and deteriorates the quality of the adhesive film;
- use of cheap analogues of Betokontakt for “heavy” finishing.
“Heavy” wall cladding with porcelain stoneware Source otdelkino.ru
Dust can be invisible, but it actively sticks to the primed surface. The plaster and glue will peel off from such a base. You will have to do the pre-treatment again.
The solid filler is heavier than the other components in concrete contact. It settles relatively quickly to the bottom of any working container. Therefore, it is important to stir the composition periodically.
The original soil is stored in an airtight container for only 2 years, analogues from six months. Mostly natural ingredients will most likely not cause any harm to health after the expiration date. But quality indicators will noticeably decrease. After sub-zero temperatures during storage, it will be possible to work only with frost-resistant soil. But in any case, it is applied at temperatures above +7 – +10°C to +25°C. This applies to the material, the base and the air.
Peculiarities
Betonkontakt cement mixtures are intended for priming surfaces. The composition penetrates deeply into the fibers of the material, creating a rough coating on which finishing work is carried out. Special polymer compounds ensure reliable adhesion of the coating to the base.
The peculiarity of the building mixture is its versatility of use, since the composition is suitable for different types of surfaces (wall panels, ceilings, floors, arches, niches).
When using the material, it is necessary to prepare a clean surface free of dust and oil stains. It must have a temperature above minus. Concrete slabs, wood, metal, tiles, glass and other painted surfaces can be used as a base for the coating.
The products are used for interior and exterior finishing works. Without the mixture, it will not be possible to create the required degree of adhesion between different covering building materials. The primer allows decorative coatings to remain in place at sub-zero temperatures in the autumn-winter period.
Application Tools
The choice of one or another painting tool depends on several points. The main ones are the nature of the building material, the shape, composition and structure of the base, ease of use. Concrete contact is a liquid mass, similar in consistency to kefir, but sometimes a little thicker.
Priming a flat surface with a paint roller Source eyecorrector.ru
A spray gun is also not suitable here because of the hard grain filler.
Since the composition of the concrete contact primer does not include organic solvents, acids, alkalis, or other aggressive components, it is permissible to use tools with any bristles and fur coats by nature. But there are still restrictions.
Soft materials quickly become unusable due to sand. Flat brushes do not pick up much thick mass and do not distribute the filler well over the base. It is more rational to use brushes with hard or medium-hard bristles. In general, it is more difficult to work with a roller for three reasons:
- the grain component is unevenly distributed on the surface;
- solid particles actively scatter over the area depending on the speed of rotation of the roller;
- Short pile and fur take up little soil, while long pile significantly weighs down the tool and splashes more.
As a result, the soil and concrete contact with minimal losses and maximum quality will be applied using a brush with synthetic or mixed bristles.
Distribution of betocontact with maklovitsa Source gidpokraske.ru
In terms of length, it is better to choose medium. It is noticeably easier and faster to work with a roller, but the consumption of the applied acrylic composition will increase, the solid filler will be unevenly distributed, and a lot of debris and splashes will form.
During priming, it is important to protect the skin from betocontact. The same goes for clothes and shoes, if they are not work shoes. Before drying, the composition is easily washed off and washed off. But the splashes and droplets begin to harden after just a few minutes.
After drying, the primer will be very difficult to remove due to its high adhesive ability. The fabric will have to be cut and scraped, but damage cannot be completely avoided. Concrete contact can be removed from the hairline only together with the hair. A rich cream or oil can make the task easier and reduce trauma.
Advice from experienced professionals
Betonokontakt should be purchased only in specialized stores. This is one of the guarantees of the quality of the material.
Before purchasing, it makes sense to make sure that there are certificates for this product. If there is no certificate or if you find poor-quality packaging (for example, wrinkled or unmarked), you must refuse to purchase it at this outlet.
After opening the package, you must ensure that the composition is uniform. The presence of lumps indicates low quality or expired.
All surfaces should be treated in several stages (in parts). This will allow you to achieve the highest quality and uniform application.
Popular manufacturers
With the use of concrete contact primer, we’ve figured out its basic characteristics, and let’s get acquainted with the distinctive features of compositions from different manufacturers.
Knauf brand soil Source stpulscen.ru
Let’s take the original version of Betokontakt as an example: it dries in 3-4 hours, the consistency is a little thick, the condition is viscous, the filler is fine-grained. Below we consider individual properties of analogues:
- Bolars is too thick, difficult to work with, takes more than a day to dry;
- Olympus - expensive, but not inferior to the original composition;
- Osnovit (Bettokont) - sand settles quickly, dries in up to 2 hours, the manufacturer limits its use only for gypsum solutions;
- Plitonite – the filler is lightweight, so it settles slowly and does not require frequent mixing;
- Pufas – marked by lower adhesion to concrete against the background of Betokontakt;
- Prospectors - dries up to 4 hours, the sand fraction is coarse, which is important for rough leveling finishing and heavy cladding;
- Ceresite is the most common object for counterfeiting.
The German brand Knauf produces relatively inexpensive soil. It has low moisture resistance, so applying liquid solutions is not recommended. In contrast, they put a moisture-resistant sample with marble chips under the Shtock brand.
Akrimax-Lux brand soil Source storg.ru
Consumption
The consumption of concrete contact primarily depends on the size of the sand particles and the condition of the treated surface. If it is too porous and rough, it will require more material than if it is smooth.
Let us give the consumption of concrete contact per 1 m2 for various surfaces:
- For painted walls, metal and glass bases, ceramic tiles, and other smooth and low-porous coatings, 150 g/m2 is required;
- Medium-porous structures made of concrete slabs and finishing bricks will require 300-350 g/m2;
- For very rough substrates such as concrete, building bricks, the consumption rate increases to 500 g or more per square meter.
To reduce costs, for highly porous substrates, conventional deep penetration primers are used, which are much cheaper.
Briefly about the main thing
Betokontakt is made from acrylic dispersion, fine-grained solid filler, and functional additives.
Almost all manufacturers add pigment additives to the composition to monitor the consistency of the coating.
The main task of the primer is to create good adhesion of solutions with smooth and dense concrete. Additionally, such substrates as ceramic cladding, brickwork, and oil paint are considered. Such surfaces are not always included in the list of acceptable ones for a particular brand of soil.
In the recommendations, you must find out information about the possible use of the material outside and in wet rooms, since not all options are universal.
Composition of "Betonokontakt"
"Betonokontakt" is a complex material. It is based on such materials as:
- cement;
- polymer fillers;
- sand;
- specialized additives (they may differ slightly among different manufacturers).
It is worth noting that all components are absolutely inert, hypoallergenic and environmentally friendly.
The surface primed with Betonokontakt dries quickly.
