Scope of application of concrete contact

The areas of application of concrete contact are extremely diverse, but not everyone knows what it is and what qualities it has. In order to form a reliable opinion about this primer, as well as to figure out where it is used, you need to familiarize yourself with many of the nuances that distinguish this type of soil.

Peculiarities

The concrete contact primer is designed to bond absolutely incompatible surfaces together. It can be used to attach new ceramic tiles to old ones, for example. It improves the adhesive characteristics of smooth surfaces so that the adhesive can adhere to other coatings. And this applies not only to smooth materials, but also to all others, from concrete to wood.. The contact between the concrete primed material and the new coating will be optimal.

Such indicators are achieved due to the improved technical characteristics of the mixture. It contains some additives that significantly increase adhesion, which makes the surface slightly rough to the touch after processing.. This is the first feature: the surface will not be smooth, it will be rough. This will lead to the fact that dust will strongly adhere to the treated wall, so you will have to act quickly.

Unlike other priming mixtures, it is not very convenient to use a colorless concrete contact. This is due to the fact that the surface must be impregnated with this solution evenly and well, and when processing with a transparent composition, bald spots and empty spaces will not be visible. Another thing is colored soil: the unevenness of the color is visible immediately, and after drying, you can correct the layer by “walking” with a roller over the problem areas again. Thus, a higher quality of surface treatment is evident.

Concrete contact is safe for humans. When working with the mixture, only basic precautions are required, and then neglect of these rules will not lead to harmful consequences. As a rule, even on contact with the skin, the composition does not cause allergic reactions, and simply removing it with water and soap is sufficient.. It’s another matter if the human body is prone to all kinds of allergies.. Then it is best to work with gloves and fully covered clothing to avoid possible complications..

Another feature of concrete contact is the ability, as it were, to preserve the surface, protecting it from the negative effects of moisture or low temperatures in winter. At the same time, the mixture itself does not tolerate negative temperatures. Thus, only the treated areas can be cooled dry.. When storing concrete contact composition, the temperature should be from +5 degrees to +30 degrees, otherwise it will lose its properties, stratify and become unusable.

Therefore, you should take a responsible approach to the choice, be sure to make sure that the material was stored in the store under proper conditions..

Concrete contact differs from all other priming mixtures and drying speed. In order to “grab”, he needs 2-4 hours, depending on the manufacturer, and complete drying is achieved in two days. Therefore, you will have to work quickly, otherwise dust will stick to the treated walls, and the processing will need to be repeated. However, you shouldn’t rush too much.. It is necessary to let the layer dry for the specified time (usually it is 2.5-3 hours), only then apply a new layer of concrete contact, plaster or glue.

It should be borne in mind that concrete contact is intended exclusively for internal work.. Don’t use it outside – it’s a common mistake. When wet, most concrete-contact mixtures simply go off with a film, so there will not be much use from them. It is much better to use ordinary outdoor primers. There will be more sense and less money spent.

Do not mix concrete mixes from different manufacturers. Despite the fact that they all have similar characteristics and ingredients in the composition, practice has shown that mixing different solutions gives a negative result: some of the properties declared by manufacturers are lost, and concrete contact is not much different from an ordinary primer.

Advantages and disadvantages

If you collect all the specific features inherent in concrete-contact mixtures, it will be possible to compile lists of their positive and negative qualities. so, the advantages include certain characteristics:

  • Application speed. Since the material can be applied with a wide range of tools, it does not take much time. However, you should check the instructions on the packaging. It indicates whether you can use any of the tools to work with this composition. For example, some concrete contact primers cannot be applied with a roller, but only with a brush, while others are “friendly” with all tools.

  • Drying speed. Unlike all other soils, concrete contact has a record setting speed, which was already mentioned a little earlier..

  • Waterproofing qualities. When applied and dried, the concrete contact forms a moisture-protective film, thereby improving the overall waterproofing. If a deep penetration composition is chosen, then it additionally protects the surface from water vapor. For example, such high-quality protection from moisture is needed before making a self-leveling floor.

  • Profitability. The consumption of the mixture is calculated for each square meter. So, the average is about 350 ml. According to approximate calculations, a standard 10 liter bucket is enough to process 3 square meters. m area.

  • Long service life. Manufacturers claim that the coating can last for 80 years. Since the material appeared relatively recently, it has not yet been possible to test this theory..

  • Versatility. It means that concrete contact is used for processing various internal surfaces. For example, it can be applied even if the old topcoat has not been removed. Concrete contact adheres perfectly to oil or acrylic paint, whitewash, drywall, concrete, iron or wood surfaces and even glass.

  • Antiseptic properties. With the help of concrete contact mortar, it is possible to prevent the appearance of fungus, mold and other microorganisms on the surface, which will have a positive effect not only on functional qualities and service life, but also on aesthetics..

  • Security. As a rule, the composition does not include all kinds of chemicals and toxic additives, but mainly natural ingredients are used, so that it can be considered environmentally friendly..

The abundance of advantages, however, does not exclude the complete absence of disadvantages, which include some provisions

  • Scope of application. So, it is rational to use concrete contact only indoors, and not outside the building, since when used in outdoor work, some of the declared qualities will be lost. It is necessary to pay attention to the purpose of the mixture: some of them are intended only for working with certain materials (for example, concrete).

  • Limited temperature conditions. Neither store nor work as a concrete contact primer at low temperatures. The temperature should be from +5 to +30 degrees, which creates certain inconveniences. In addition, damage to concrete contact during freezing does not speak in its favor..

  • The need for preliminary surface preparation. To achieve a good result, it is necessary to properly clean the surface from dust and dirt, remove fragile places. In fact, the statement that the mixture can be applied to the existing finishing layer turns out to be a lie, because the old surface must be durable.

  • The need for strict adherence to instructions. Depending on what material is purchased, which company produced it, the technology of its application also varies. The only thing that remains unchanged is that it is impossible to add water to the finished mixture and work at temperatures below +5 degrees. Only if you follow all the requirements stated on the packaging, you can achieve a guaranteed result..

  • Correct application. It is necessary to take into account the nuances of surface treatment. For example, at a time, you need to process only such an area that will be immediately worked out in the future. Of course, if you processed the entire wall at once with concrete contact, then nothing terrible will happen. You just need to reapply the composition, which will lead to unreasonable monetary costs. This situation is one of many to keep in mind when getting started..

  • Price. Many people find the price of such a primer above average, but this is justified by the properties of the material. No other soil can guarantee that it will be possible to combine two materials with incompatible characteristics. Of course, there is a cheaper alternative – the installation of a textile mesh with the subsequent application of putty, but no one has been using this method for a long time, since it is more laborious and time-consuming..

It is much easier to buy a concrete contact and just cover the surface with it.

Specifications

All concrete contact soils have similar technical properties, which determine their advantages and disadvantages.. By the way, in many ways they overlap with the advantages already listed, so it makes sense only to list them briefly:

  • high drying speed;
  • increased moisture resistance;
  • profitability;
  • durability;
  • reliability;
  • safety for humans and animals.

Concrete contact mortars are produced in two fractions: 0.3 mm and 0.6 mm. The first option is used when preparing the surface for filling, the second – before plastering. The composition includes quartz, depending on the size of which one or another type of fraction is indicated. It is worth noting the presence of two types of quartz in concrete contacts: needle and ordinary.

  • Ordinary ones have a standard cubic shape. They are used in most formulations. It turns out that the edges partially cover microcracks on a smooth surface, improving the adhesive properties.

  • Needle quartz flat. They fall into microcracks, penetrating into them almost to the very bottom. Thus, the concrete contact primer adheres to the surface much better, and the new coating is fixed more reliably..

The difference between ordinary soil, composition with ordinary quartz and acicular is visible in the second image..

As a rule, concrete contact is made on an acrylic basis, which determines its resistance to moisture. Acrylic is not a water-soluble material. Usually, the primer layer is not removed, but if suddenly such a need arises, then it will be necessary to use special solvents.

Usually, concrete contact primers are produced in white, but there are also bright pink. The intensity of the color will show how evenly the layer of material is applied. To check the dryness of the material, you will need to use a spatula. If you lightly stroke the surface, you will immediately see whether the concrete contact is dry or not. So, after 2-3 hours after application, there will be no traces on the spatula..

Please note that the setting speed depends not only on the characteristics of the soil, but also on the conditions in the room: humidity level, temperature, presence of drafts..

The release of concrete contact compositions is coordinated with the standards of GOST. So, it is worth focusing on group 28196, as well as 52020-2003, which regulate the production of concrete contact mixtures.

Packing depends on the form of release of concrete contact soil. On the market, you can find ready-made mixtures of the consistency of liquid sour cream or powdered products, which in the future must be diluted with water on their own according to the instructions. You can find ready-made primers in buckets and cans of the following masses:

  • 1.3 kg;
  • 3 kg;
  • 5 kg;
  • 6 kg;

  • 10 kg;
  • 12 kg;
  • 20 kg;
  • 25 kg;
  • 40 Kg.

Application area

The main purpose of a concrete contact is to increase the adhesive properties of materials in which these characteristics are much lower than average. And also the solution helps to preserve the surface, protect it from sudden jumps in humidity as a result of changes in temperature conditions. Additionally, it protects the surface from the appearance of mold fungi and other microorganisms on it, the vital activity of which affects the appearance and functional component of the surface not in the best way.

Concrete contact is suitable for processing the following substrates:

  • dense monolithic concrete;
  • aerated concrete;
  • foam concrete;
  • brick;
  • cement and cement plaster;

  • gypsum and gypsum plaster;
  • gypsum fiber sheets;
  • drywall;
  • cement-bonded particle boards;
  • tongue-and-groove plates.

Basically, concrete contact is used when the base cannot normally absorb moisture, and just because of this, its adhesive properties are practically at zero. Separately, it is worth highlighting the cases when the ceiling surface is processed. Then only concrete contact primer is used without subsequent plastering. Concrete contact is used immediately before applying the finishing layer. You do not need to process it on top. It is enough to apply glue or immediately decorative plaster – in a word, a finishing layer.

It doesn’t matter what kind of surface is being processed – floor, ceiling, wall. Concrete contact is equally suitable for sealing the ceiling, and for decorating the base for a self-leveling floor or concrete screed. Most often, of course, walls are treated with concrete contact, if the repair is done only for cosmetic purposes, and you do not want to spend energy, time and money on dismantling the old coating. The complexity of the architecture does not matter either. It doesn’t matter what will be processed – a ledge, a niche, a multi-stage architectural structure.

Concrete contact primer penetrates equally well into surfaces, ensuring optimal adhesion even on protruding elements.

The production of special formulations has been established, which are used for some of the same materials. The advantage of choosing such a solution is that during the development and production, all the specific features of a particular coating were taken into account, and the ratio of ingredients in the concrete contact primer was selected in such a way as to ensure the maximum degree of adhesion. Concrete contact soils for concrete foundations are very popular..

On sale there are special concrete contacts designed for work outside the building. If there is no urgent need, it is better to refuse to use them – the effectiveness of their use is greatly exaggerated. If such a primer is really needed, you need to look not for universal concrete contacts, but for intended exclusively for outdoor work. Only such a composition will give a more or less good result..

Subtleties of use

So, the necessary conditions for the use of concrete contact is preliminary surface preparation. To do this, you need to perform a certain sequence of actions:

  • First you need to dust the surface with a brush or broom. This is where dry blasting comes into play: your job is to assess the scale of the contamination and to remove as much as possible without the need for complex cleaning. In the future, this will greatly simplify wet work..
  • Remove all dirt from the surface with water and a cleaning agent. Pay attention to the thoroughness of the work. There should be no dirty and dusty areas, stains.
  • The surface is washed again with clean water. All traces of the cleaning agent are removed. The base must be washed, so to speak, before it squeaks..
  • Leave the surface to dry completely. Mixing with water, the concrete contact primer loses some of its properties, so it is better not to risk it.

The procedure for applying the composition itself does not present any particular difficulties.. You can use the following toolkit for this:

  • paint brush;
  • roller;
  • bristle brush or wide brush with thick bristles;
  • spatula or mallet.

One of these tools must be applied to the surface of the composition in a thin layer.. Please note that the surface must initially be completely dry.th. The same applies when the concrete contact is applied in two layers. So, the first of them must dry completely before you can proceed to reprocessing..

The best option for applying a primer to concrete contact is a brush, since it allows you to vary the intensity of the layer as you wish, but many prefer the roller because of its ability to completely “give away” the composition being recruited, thereby rationalizing the consumption of funds.

After the surface is processed and the applied layer is even, it is necessary to wait until the primer is completely dry. This may take 24-48 hours. This is not about setting, but about complete drying. So, after 3 hours it is still too early to apply the finishing layer. Checking the readiness of the wall is easy: the material on which it is carried out with an ordinary metal spatula easily leaves. If this happened, then the concrete contact has not yet dried out..

However, you cannot wait too long. This is fraught with the fact that dust and other contaminants will adhere to the surface treated with concrete contact, as a result of which the adhesive properties will be greatly affected. To avoid this, all activities must be carried out according to the time given in the instructions on the package.. A win-win option is to treat the surfaces in the evening with concrete contact primer, and in the morning to move on to the rest of the finishing work.

Tips & Tricks

Professionals willingly share some useful tips that will help you complete the work on applying concrete contact primer quickly, easily and efficiently..

  • According to many recommendations, the surface before applying concrete contact should be treat with an ordinary primer. This will strengthen the surface in case there are peeling areas somewhere, through an oversight. And it will also completely remove dust from the surface, allowing the concrete contact in the future to adhere as well as possible to the original base..

  • When choosing, you should not focus only on the price of the composition. It is not at all an indicator of quality. However, it is worth remembering that too cheap mixtures a priori cannot be of high quality, since the raw materials used in the production of concrete contact products are quite expensive. The optimal solution is to read reviews of certain compositions, as well as buy soils only from trusted manufacturers.
  • When calculating the material consumption, keep in mind that it depends not only on the characteristics of the mixture, but also on initial state of the surface. Porous substrates require more concrete contact and multiple coats, while for smooth surfaces one thin layer may be sufficient. So, least of all the mixture is used when priming drywall structures, since drywall has practically no pores on the surface..

  • Before buying, be sure to ask availability of a quality certificate for the product, as well as the conditions in which the mixture was transported and stored. It may be that when you come home, you find that you have bought low-quality products. It is not uncommon for the concrete contact to simply delaminate, and all the additives responsible for improving adhesion ended up at the bottom. By applying such a solution to the wall, it is impossible to get an even layer..

  • It is not always possible to determine the quality of products “by eye”, but the presence of lumps in the mixture is a clear indication that you are dealing with a poor-quality or expired product. And in fact, and in another case, it cannot be used. Your best bet is to return the concrete contact to where you bought it. For this reason it is better to buy a primer in specialized hardware stores, and not in the markets, since in the second case, the seller of low-quality goods can quickly disappear, and you will lose money.

  • Work with concrete contact without problems you can do it yourself. They do not require any special professional knowledge or preliminary training. However, if you need everything to be done promptly, it is best to entrust the finishing to professionals. They will be able to process an entire room at a time, which is simply not possible for one person..

Manufacturers

Buying goods from a trusted manufacturer that has proven itself in the market is already half of the success. Below is a list of the 10 most popular companies on the market that are trusted and respected by builders not only in Russia, but also around the world..

  • Axton. The company offers a wide range of dry mixes intended for subsequent self-preparation. If you follow the instructions, you will get a high quality concrete contact with a low consumption (about 300 g per 1 sq. M.) And a high drying rate (“sets” in about 2 hours at room temperature).
  • “Plitonite”. This brand belongs to the German concern Mc-Bauchemie. The latest production technologies and excellent quality of the raw materials used guarantee high quality characteristics of the concrete contact produced by this company. Sold ready-to-use.

  • “Optimist”. One of the few firms to offer a truly worthwhile concrete contact for outdoor use. But the disadvantage is that the drying time of this material is twice the speed of “setting” of all other similar products. Here it is 4-6 hours.
  • Bolars. This manufacturer produces a high-quality product that significantly increases the adhesion of the subsequently applied compounds to the substrate. Concrete contact mortars are suitable for preparation for the application of gypsum, cement or polymer products. Sold ready-made.

  • “Kreps”. The company produces dry building mixtures. A distinctive feature is that concrete contact compounds are offered here, suitable for different rooms: bedroom and living room, bathroom and kitchen, as well as for external work.
  • “Osnovit”. The concrete contact primer from this manufacturer deserves special attention. This is due to the fact that it has special frost-resistant properties, and also tolerates extremely high temperatures well. So, the temperature range is 120 degrees – from -50 to +70 degrees. It is worth noting that there are no more analogues with the same characteristics on the market..

  • Knauf. This manufacturer has proven itself well. It has been offering its products for a long time, which are distinguished by consistent quality and reasonable prices. This also applies to concrete contacts. Technical characteristics remain at an average level: setting time – 3-4 hours, consumption – about 350 g per 1 sq. m.
  • Ceresit. Concrete contact from this manufacturer is one of those that cannot be applied with a roller. It is imperative to use a brush here. It is worth mentioning that this material has a water dispersion base, and not an acrylic one. For this reason, it must not be mixed with water: the concrete contact primer from this brand is water-soluble.

  • “Prospectors”. Concrete contact has a wide range of applications. It can be used on a wide variety of substrates, from worn tiles to the preparation of in-situ concrete for subsequent filling. The material has the highest drying speed, which is 1.5-2 hours, depending on the microclimate of the room..
  • Odysseus 2000. For many decades, this manufacturer from Russia has been selling various paints and varnishes, the quality of which is beyond doubt. The same goes for concrete contact primers. In particular, this company was the first to start using compositions with the addition of needle quartz instead of ordinary ones, so its developments can rightfully be considered one of the best in the field of primers..

Reviews

Reviews on the use of various concrete contact soils are mostly positive. This is because with the invention of this material, making repairs has become much easier. You can now quickly update the look of a room without having to completely clean an oil-painted wall, for example. After all, dismantling this paint causes many problems, since it cannot be washed off with ordinary water. It became more convenient to clad concrete walls, since there was no need to build a gauze bandage so that the plaster somehow kept.

Some respond negatively only to the fact that there is a need for additional financial costs for this type of primer. This is especially of concern to those who have to process porous walls, for example, brick.

For information on how to use concrete contact, see the next video.

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