Connect the incompatible. task for concrete contact

Advantages and disadvantages

The almost “magic” material has more of the first, but there are also some disadvantages.

First you need to list the merits. These include:

1. Versatility. The mixture does not require tedious and thorough surface preparation prior to application. The only conditions are their smoothness, the inability to excessively absorb moisture.
2. High strength. Any construction work is not afraid of the dried layer of concrete contact. Cracks will not appear on it even when drilling.
3. The ability to make porous surfaces maximally protected from moisture. This applies to gypsum, wood, brick and foam, aerated concrete.
4. Absolute insensitivity of the dried material to significant temperature changes. However, it can be applied if it is above + 5 ° outside.
5. Environmental friendliness. There are no toxic substances in the adhesive composition that would make the primer unsuitable for interior work.
6. High drying speed. A few hours after surface treatment, you can proceed to further finishing work.
7. Durability of the layer. Manufacturers claim that the primer does not lose its qualities for 80 years.
8. Complete absence of fear of ultraviolet radiation and fire safety.
9. Water vapor permeability due to breathable polymers.

This list can include the unnecessary gauze bandage, which was previously used to fix "recalcitrant" plaster, and the ease of work for beginners: spreading pink "sour cream" on the surface (but not on the ceiling) is quite simple.

The disadvantages of concrete contact are still relative. It:

• fear of dust, it requires mandatory preliminary dedusting of surfaces;
• the need for constant stirring due to the fact that heavy ingredients "strive" to settle to the bottom.

As you can see, the advantages prevail over the disadvantages, which can not be considered as such at all. Many positive qualities make concrete contact a truly unique material that guarantees convenience, speed of work and reliability of finishing.

Application of concrete contact for different wall surfaces: how to apply a primer to a painted wall, should it be primed under a tile?

A special type of primer coating - concrete contact - appeared on the Russian construction market relatively recently. The article tells about when it is advisable to use it, and when it is better to save money, working with cheaper soils.

Concrete contact: a primer with superpowers

For the installation of building materials, adhesives with special compositions are used that are capable of supporting the weight of tiles, porcelain stoneware, drywall.

At the same time, the strength of the fastener depends not only on the capabilities of the adhesive mixture, but also on the properties of the base on which the work is carried out.

Concrete contact (abbreviated as BK) is a special type of primer that connects materials that are difficult to adhere to: wood, glass, metal. There are no analogues of this composition.

What is concrete contact: purpose and features

Concrete contact is a cohesive acrylic primer with the addition of quartz. This type of primer is used to roughen the subfloor to provide greater strength to the fastener. In addition, it has increased moisture resistance.

BC is of two types:

• under the putty;
• for plastering works.

A distinctive feature of this composition is its versatility, which gives ample opportunities to use it for working with concrete, brickwork, plasterboard, porcelain stoneware, tiles, painted surfaces, wood, metal, glass.

Scope of concrete contact

The appearance of a concrete contact in the arsenal of means for carrying out repair work has greatly simplified the work of builders and finishers. Most often, this composition is used as a primer for

• walls made of concrete, brick or cinder block to increase the ability to adhere to the finishing material;
• drywall to reduce porosity;
• gluing elements with a smooth surface on any materials, incl. glossy;
• ceiling in front of whitewash;
• conservation of plastered areas for the winter period.

Conditions for processing walls with concrete contact

To work effectively with this primer mixture, a number of conditions must be met:

Work is carried out only in freezing temperatures.
High air humidity negatively affects the properties of concrete contact, therefore it should not exceed 70%.
After applying the solution, the surface must dry for at least 12 hours.
The surface on which the primer is applied must be prepared in advance

It is important to minimize the amount of dust; for this, washing with detergents is allowed. Irregularities are leveled.

How to apply concrete contact on walls

The mortar is applied to the walls with a wide brush, trowel or roller. A two-layer application is recommended, after which the base must be dried for a long time.

Application under tiles on walls

The use of a concrete contact under a tile is justified when the surface has extremely low levels of hygroscopicity and adhesion.

Professional finishers are skeptical about the use of BK for tiles and use it in exceptional cases when installing on problematic non-absorbent surfaces - for example, on drywall, if the walls were aligned with it. When installing tiles for interior rooms, conventional primers are more often used.

On painted walls

There is a widespread belief that BC is ideal for priming walls painted with oil paint (which often cannot be removed at all). This opinion is erroneous and stems from a misunderstanding of its composition and properties. The mortar forms a thin film, which requires a minimum surface absorbency to consolidate. In simple words, a concrete contact can hold on to oil paint, but whether it will hold a tile with a layer of adhesive mixture is a question that experts do not give an unambiguous answer to.

Primer

BK is used for priming walls made of brick, cinder block or concrete before applying oil paint or under plaster to increase adhesion. It is in this case that its use is advisable.

When can further work be done

The solution dries quickly enough - about 5 hours, some brands even faster - from 3 hours. But experienced craftsmen put more time for drying, applying the solution in the evening and leaving it for the whole night.

Betonokontakt is a unique “narrow specialization” primer coating. The cost for it is higher than for other types of soils, therefore, before buying, you should carefully read the information on the packaging and consult with more experienced craftsmen about the application in a particular case

Such caution will allow you not to spend too much and save on other repair needs.

Recommendations for surgery

In order to do the job flawlessly on the first attempt, it is better to listen (owe?) To the advice that the masters share with the beginners.

Purchase and preparation of the composition

1. Buying a quality product that has many positive reviews is the only way to protect yourself from all kinds of fakes. Checking the packaging (expiration date), quality certificate "without leaving the checkout" will give a chance to purchase a fresh and efficiently working product.
2. If you are not sure what kind of primer is needed for a specific surface, then it is better to get all the information from sales consultants.They will post all the necessary information - about the manufacturer, about concrete contact: consumption, features of the types available for sale.
3. After opening the package, the primer, similar in consistency to the paint, is also thoroughly mixed, for example, with a mixer-attachment. A high level of humidity (more than 75%) becomes an obstacle to the application of concrete contact. It will prevent the material from drying "properly".

The homogeneity of the mixture is the first sign of a quality product. Any lumps in a freshly opened container suggest otherwise.

Surfaces and work

Concrete contact does not like greasy stains on the paint, so problem areas are washed (wiped) with a sponge, then degreased. The use of a conventional primer will slightly reduce the consumption, since it will do its job - it will fill all the cracks in the base.
Large and small debris, dirt, irregularities or suspicious areas that threaten to crumble soon are obstacles that will have to get rid of. A prerequisite for work is a clean, but completely dry substrate.
Liquid-absorbing surfaces are sufficient reason to apply two layers of concrete contact. If the substrate has serious defects or unusual relief, then re-treatment of this problem surface is also required.
The tool is selected based on convenience, surface area. It can be a roller, brush, spray gun.

In the latter case, it is important that the size of the nozzle cannot impede the exit of the mixture components. Wide brushes are ideal

Rollers, on the contrary, increase the consumption, absorbing a large amount of the composition.
Mandatory drying of each layer, regardless of their quantity, is a rule that applies to almost all construction work. However, it is impossible to linger with fixing the finishing material on the last dried layer. Otherwise, enough dust will settle on it, and it will reduce the strength of the contact. Protection of the foundation from it is necessary. If 48 hours have passed after applying the concrete contact, then a new surface treatment will be required: this time with an ordinary deep penetration soil.

If not all of the concrete contact is used, then the package is stored at room temperature. Sending it for "wintering" on an open balcony is prohibited: as after freezing, the primer loses its unique properties. The shelf life of the material is from 6 to 12 months.

Preparation of concrete walls for plastering

The process of preparing interior walls made of concrete for plastering consists of the following stages:

1. The old coating is removed in the form of fragile plaster, whitewash, paint (in which cases it is possible to apply plaster on old paint, we recommend reading here);
2. Defects of concrete walls are determined. If there are nodules, they are cut down with a hammer and chisel. Massive chips and deep cavities are sealed with a cement-sand mortar in a ratio of 1: 3, if necessary, steel meshes are used for reinforcement;
3. On smooth walls, notches are made with a hammer and chisel, the maximum step of the notches is 10 cm;
4. If a hidden wiring device is needed, wire strokes are made;
5. The concrete surface is cleaned. A brush and water are used to remove dust and dirt. Wall treatment can be carried out using compressed air or a strong jet of water, which significantly speeds up the cleaning process;
6. A primer is applied to the wall surface.

Notches on the concrete wall

We'll talk more about the types of primers for concrete walls later.

Priming concrete walls before plastering

Priming of concrete walls is necessary in order to:

• Reducing the absorption of water from the solution into the concrete base;
• Protecting the concrete wall from the formation of mold and mildew;
• Increasing the strength of the protective (surface) concrete layer;
• Dedusting the concrete surface. The primer binds dust particles and makes the substrate clean;
• Improving the adhesion of the plaster to the concrete base.

Applying a primer to a concrete wall

Next, we will consider how to prime concrete walls in front of plaster:

• For smooth concrete surfaces, concrete contact primers are ideal. After application, the composition fills the pores in the concrete, and a rough layer with high adhesion forms on the surface, which contributes to good adhesion to the future plaster. We recommend formulations of the following manufacturers: Feidel Betokontakt, Knauf Betokontakt, Prospectors Beton-Kontakt.
• Old concrete surfaces can be reinforced with a deep penetration primer specially formulated for impregnating fragile substrates. Such a soil impregnates the top layer of concrete, thereby strengthening it and giving it the necessary strength. From manufacturers we recommend: Prospectors "Deep Penetration", AquaNova "Nova", Optimist acrylic "Deep Penetration".

Deep Penetration Prospector Primer

For the preparation of porous concrete surfaces (aerated concrete, foam concrete), primers are required that reduce the absorbency of the base, thereby preventing uneven setting of the solution. The following primers are perfect: Knauf Mittelgrund, Knauf Rotband Grund (for gypsum plasters), Ceresit CT 17, Toiler TR10.

Remember to follow the manufacturer's instructions when applying the primer to the substrate. As a rule, the primer must be shaken before application, and the application process itself must be carried out in several layers.

Installation of beacons and reinforcing mesh

If the old wall has drops of more than 10 mm, then it is necessary to install beacons before applying the plaster. Lighthouses are needed for even application of plaster in the same layer in thickness. It is better to use metal profiles as beacons.

Lighthouses on a concrete wall

If the thickness of the planned plaster is more than 20 mm, then it is necessary to additionally arrange a reinforcing mesh. The mesh is fastened to the wall using dowel-nails.

Next, you need to prepare the solution in accordance with the manufacturer's instructions. To avoid the formation of lumps, add water to the dry mixture, and not vice versa.

Primer concrete contact: features and consumption per 1m2

A primer is a unique solution that is used to prepare a specific surface for finishing, such as painting. The use of such a building mixture allows you to level the surface, get rid of any defects on the wall and eliminate small cracks.

One of the most popular types of primer is concrete contact, the use of which greatly simplifies further finishing work.

Main characteristics and properties

Concrete contact is an acrylic-based building mixture that also includes cement, sand and special additives. This mixture is actively used to increase the adhesion of a surface that does not absorb moisture well, before plastering, laying tiles and other finishing work.

Among its main advantages are the following:

• high drying speed. Further finishing work can be started a few hours after applying the primer;
• moisture resistance. During the drying process, a special film is formed that does not allow water to pass through;
• durability. According to the manufacturer, the concrete contact primer has not lost its qualities for 80 years.

Thanks to its unsurpassed properties, concrete contact has been able to establish itself as a unique material that is durable, does not need a lot of time to dry and does not allow moisture to pass through. It is these properties that allow you not to worry about the quality of the repair done.

How to determine the consumption of concrete contact?

Consumption of concrete contact per 1m2 depends on many factors, among which the first place is occupied by the features of the treated surface

What matters is not the type of surface itself, but the porosity. It determines how much of the primer will be absorbed, which has a direct effect on its consumption per m2

Primer consumption table concrete contact from different manufacturers

Depending on the porosity, the following types of surfaces are distinguished:

1. Porous surfaces, which include brick or sand concrete. The primer is absorbed quite intensively, which leads to the consumption of concrete contact up to 0.5 kg per m2. If the porosity is too high, then you will first need to treat the surface with special solutions.
2. Surfaces with medium porosity. These include concrete, concrete tiles. Consumption of concrete contact is about 0.3 kg per m2.
3. Low-porous surfaces, for which the consumption of the primer is minimal - 0.1-0.2 kg per m2.

Is it possible to reduce the consumption of primer?

Most people wonder if it is possible to reduce the consumption of concrete contact primer. The answer is definitely no. First of all, this building mixture is notable for its affordable price, so there is no point in saving on it. In addition, this can lead to a decrease in the strength of the material, which over time will begin to crack or flake off.

It should be remembered that the quality of the primer and the work done on its application has a direct impact on future finishing work and the quality of the entire repair in general. If you reduce the amount of concrete contact primer per m2, the surface will lose its adhesion properties. In the future, this may cause the coating to separate from the base.

Reduced primer consumption may result in loss of surface adhesion.

The primer plays an important role in the process of ensuring the waterproofing of the surface, which can be disturbed when the amount of mortar per m2 decreases.

Do not forget about an important feature of some finishing materials, which is that some coatings can dry out. The fact is that gypsum or Portland cement is present in their composition, and drying out becomes a natural reaction to a decrease in the amount of water.

Thus, the use of concrete contact is essential for the future of the entire renovation.

All the nuances of using this building mixture should be taken into account. The level of concrete contact consumption per m2 depends on the type of substrate and its porosity

It is not worth saving when using a primer, as this can negate all further finishing work.

It is interesting: DIY repair of a small kitchen in Khrushchev

The procedure for working with concrete contact

Before applying the concrete contact to the surface, it is recommended to stir the primer composition to evenly distribute its components. If this is not done, the sand can settle at the bottom of the package and thus no positive effect will 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. It is necessary to apply Concrete Contact with a brush or roller. Also suitable devices for applying the mortar are a spray gun and a plastering station.

The base is processed in two layers:

1. The first is considered a safety net, and when applied, Concrete Contact can be mixed with an ordinary deep penetration primer.
2. The second layer is the main one. Only pure concrete solution is used.

It should be noted that the application of 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.

The application of this type of primer requires compliance with a certain temperature regime.

It is important that the range of permissible temperatures is within the range from +5 to +30 degrees Celsius.The use of concrete contact at low temperatures will affect its consistency, which will lead to difficulty in working with the material

How to plaster concrete walls

The general word "plaster" hides a great variety of different materials. To make it easier to navigate in this variety, it is customary to classify plaster compositions by the type of base, place of application, additional functions, etc.

By appointment (in relation to a concrete base):

• conventional (used for rough alignment of concrete walls, sealing holes, cracks, joints, cracks);
• decorative;
• special (X-ray protective, noise-reducing, sanitizing, etc.).

At the place of application: facade, universal and internal.

Since concrete is different, for example, gas and foam concrete structures are often found in private houses, not all plaster mixes are suitable for plastering. To solve the question of how to plaster concrete structures, you need to get acquainted with the main types of compositions.

Cement-sand mixture

More often than others, cement-sand mixture (DSP) is chosen as plaster on concrete for outdoor work. Cement is a binder that forms a high-strength artificial stone that is resistant to frost during the hardening of the solution. Sandy filler does not reduce the strength of this stone, but it can significantly reduce the amount of cement used. The size of the sand grains affects the workability of the mixture, the texture of the cement coating.

In addition to these two components, additives are used in the cement mixture, which give the mortar the necessary qualities. They are used to increase the plasticity of the solution, increase frost resistance, water resistance, as well as other parameters of the working mixture and finishing coating. For some coatings, white cement is used.

Main advantages:

• strength (depends on the brand of cement used, the ratio of the components);
• durability;
• frost resistance;
• waterproofness;
• versatility (used on the street and in different types of rooms);
• ease of preparation and application of the solution;
• maintainability;
• availability, low cost of components;
• manual, mechanical application is possible;
• fire resistance;
• good adhesion.

The cement compound is not suitable for use in areas with seismic activity, as well as for houses located close to railways. Mineral plasters do not tolerate vibration loads, building shrinkage. Therefore, for new buildings it is more rational to choose mixtures based on polymer bases.

DSPs are not suitable for plastering aerated concrete - aerated concrete, foam concrete blocks due to their large dead weight. But for plastering concrete walls in monolithic houses, this composition is especially good.

Kneading for sand and cement plaster is often done by yourself. This significantly reduces the cost of plastering. The proportions of the main components depend on the design grade of the coating, the grade of cement, the presence of other binders in the plaster mixture.

Cement plaster is sold as a dry mix packaged in kraft bags (hereinafter referred to as CC). The shelf life of CC and cement powder does not exceed a year.

Gypsum plaster

Gypsum base is known for "fear of hydration", therefore gypsum plasters (with rare exceptions) are used for interior work. Here he is the leader.

The main advantages that gypsum mixes "boast about" are:

• fast set of strength;
• low weight of the coating;
• vapor permeability;
• environmental friendliness;
• ease of formation of a smooth surface;
• versatility (in relation to the base material);
• ease of repair;
• easy shaping when creating embossed surfaces;
• non-shrinkage of the mixture during hardening;
• fire safety;
• water retention (the solution does not give moisture to porous substrates);
• low thermal conductivity;
• high adhesion.

Cons of gypsum coatings:

• rather low frost resistance;
• setting too fast;
• instability to biological damage.

The leading manufacturers of plaster mixes have learned to cope with almost all the disadvantages of gypsum.

Other options for plastering materials

In addition to the materials mentioned, gypsum-lime, acrylic, polymer-cement, lime, silicate, polymer compositions are used for finishing concrete bases. They differ in their qualities, price and applicability to the base material. For example, silicate compounds are a good plaster for aerated concrete from the street side. Acrylic mixtures are applied in a thin layer, therefore they are not used for leveling.

Subtleties of application

Before coating the surface with Betokontakt primer, it should be carefully prepared. To do this, it is cleaned of debris and dust manually or using a construction vacuum cleaner. The composition is thoroughly mixed before application, preferably with a construction mixer, so that the fine sand is evenly distributed in the primer. In no case is it recommended to dilute the composition with water, as from this it will lose all its properties. However, some manufacturers allow the composition to be diluted with a small amount of water in order to save money.

When working with Betokontakt Knauf primer, the following rules must be observed:

• the temperature in the room where the work will be carried out should be in the range from +3 to +30 degrees;
• air humidity should not exceed 75%;
• subsequent work can be carried out only after the primer has completely dried, that is, after 12-15 hours.

After applying Betokontakt, it is imperative to check the quality of the coating. This is necessary in order to notice the defects of the primed surface in time and eliminate them in order to achieve good adhesion. To do this, it is necessary to draw a metal or rubber spatula over the dried soil, look at the crumbling of sand particles. If they are easily and in large quantities removed from the surface, then such a coating cannot be called high-quality, and finishing materials will not adhere well to it.

Betokontakt Knauf is a primer that allows you to prepare many surfaces for finishing, including those made of metal, drywall and other materials. The main thing is to follow the manufacturer's recommendations and application technology, as well as to prepare the surface to be treated well.

In the next video you will see an overview of Knauf Betokontakt primer.

Useful Tips

Here are answers to popular questions about the use of a universal primer.

1. Should I add water to the purchased mixture?

Usually the dispersion is only mixed. But sometimes the manufacturer recommends diluting the product before processing certain materials. In this case, you should not violate the ratios specified in the instructions.

2. How to apply concrete contact on plaster?

It is better to remove the fragile finish with a spatula. Then it is recommended to treat the plastered surface with ordinary deep penetration soil. It will solve a whole range of problems: it removes dust, binds the surface layer, slightly reduces porosity, and reduces the consumption of expensive concrete contact. Thorough drying is required after preliminary priming.

3. Can concrete contact be applied to paint? It is certainly suitable for surfaces coated with varnish, nitro enamel, alkyd or oil paint. It should be noted: acrylic dispersion adheres to the surface layer, therefore it is used only where the decorative coating is firmly connected to the base. If the paint peels off, it is peeled off with a scraper, beaten off with a perforator, and cleaned with coarse sandpaper.

4. How soon is the finish applied after priming?

The drying time of the concrete contact is indicated on the packaging. Usually it varies from 2-3 to 12 hours - depending on the air temperature.Even if after a couple of hours the wall seems completely dry, there is no need to deviate from the technology and rush to carry out the next operation. At the same time, do not delay the final finishing: if dust settles on the base or moisture gets in, its adhesion properties will deteriorate. In this case, it is recommended to additionally clean the base with ordinary soil. If more than 48 hours pass after the application of BC, the treatment will have to be repeated, starting with the removal of dust.

When freezing, the acrylic dispersion loses its performance properties. Therefore, the storage temperature of the concrete contact should not be lower than +1 o C, and the application of the mixture is permissible if the air warms up to +5 o C. At the same time, the walls should not be frozen, otherwise the coating will quickly fall off.

5. Which company has the best primer?

The brands Ceresit, Knauf, domestic Bolars have earned positive feedback from customers. To buy an authentic quality product, you should contact trusted stores, check the certificates of conformity, and check the production date. The shelf life of mixtures usually does not exceed 6-12 months.

When figuring out which concrete contact is better to use, take into account that an adhesive primer from different manufacturers may differ in scope.

1. Ceresit. With its help, the walls in the premises are prepared for gypsum and cement-sand plaster, tiles or putty.
2. Knauf. It is ideal for smooth monolithic concrete, reinforced concrete structures, ceilings, wet screed floors.
3. Bolars. The primer provides reliable adhesion of substrates to cement, plaster, polymer mixtures, old and new ceramic cladding. The tool is used for interior and exterior decoration. Before plastering, Bolars is applied with a sand fraction of 0.6, before putty - a composition with a fraction of 0.3.
4. Prospectors. The company produces concrete contact Universal, which fully justifies its name. The primer contains additives that increase water and frost resistance, imparting antiseptic qualities to the mixture. The station wagon is suitable for indoor and outdoor use.

In order not to spend money in vain, with an impressive processing area, it is better to start with one bucket of concrete contact and check it on a small area.

Preparing drywall for tiles

Surface priming

Necessary whether to prime drywall before laying tiles? Here, the opinions of professionals converge. The primer applied to the wall contributes to:

• decrease in moisture absorption
• strengthening fibers
• preventing the formation of pathogenic microflora on the wall from the gypsum board.

The cured plasterboard primer under the tiles creates a protective polymer layer that prevents the penetration of moisture that is in the tile adhesive.

What is the best primer for plasterboard tiles? It is recommended to treat the surface with an acrylic primer. It is non-toxic, dries quickly, spreads evenly over the plane and has high performance characteristics.

It is recommended to treat the surface with a primer as follows:

1. The wall must be well cleaned of dust particles and debris. To do this, you will have to wipe the base with a damp sponge;
2. When preparing drywall walls for tiles, the primer must be poured into a container, tray and, dipping a roller, begin to process the walls;
3. Apply the primer evenly. To process hard-to-reach areas, you need to use a thin brush, and the solution is applied with a roller to the plane;
4. As soon as the drywall primer under the tile hardens, a second coat is required.

Does drywall need to be primed before tiling? Of course, this stage in the preparation of walls for tiles is very important, the reliability of the finishing coating will depend on it.

After the preparatory measures, you can start filling.

Reinforcement of seams

It is necessary to reinforce the seam-butt-joint spaces in order to obtain the most durable and solid surface. It is the joint seams that are the most vulnerable places in the drywall structure, they can provoke the formation of cracks and cause the destruction of the facing layer, therefore, drywall must be reinforced in front of the tiles.

To prepare the wall for putty, the seams are filled with the appropriate compounds, which are selected according to their purpose:

• starting (leveling) composition is suitable for hiding various defects
• the finishing option of the putty is necessary to create a smooth base
• a special type of putty is used to seal the joints between the slabs

When choosing a filler for filling joints under a tile, pay attention to its composition. These can be gypsum, cement and polymers.

Gypsum-based plaster is not recommended for use in rooms with high humidity levels. Plasterboard putty under the tiles in the bathroom should be done with a mixture of either cement or polymer base. The latter option is distinguished by its versatility of use, high cost and high working qualities.

It is necessary to reinforce the joints between the sheets using a special tape - serpyanka. Better to use synthetic tape (construction bandage). This technique will significantly reduce the likelihood of microcracking and strengthen the surface intended for laying tiles. Plasterboard putty under the tiles in the process of sealing the joints is applied first to the problem area, after which the tape is glued, and again everything is tightened with the mixture. It is imperative to reinforce the joints by gently pressing the tape into the solution.

Plasterboard putty

Having found out whether it is necessary to plaster drywall under the tiles, you can start processing the walls.

The first step is to plaster the corners using plastic protective corners. The working mixture is applied on both sides of the corner, and the corner is inserted, the layer thickness should not be more than 2 mm. When you press on the edge of the corner, you do not need to overdo it, the excess is removed with transverse movements of the spatula.

It is necessary to plaster the wall evenly, after the finishing layer has dried, sand it with sandpaper. Tiles are laid on the putty drywall by using crosses and a special adhesive.

Putty primer

How to primer drywall under the tiles has been described above. Acrylic primer is a good option.

It is recommended to apply a protective and strengthening compound 1-2 times, which will provide a reliable base for further finishing lining. Does drywall need to be processed before tiling? The answer is unequivocal - "Yes, if you do not want to redo the repair."