Is it possible to paste wallpaper on a painted wall. The procedure for pasting wallpaper on painted walls How to paste wallpaper on oil paint

The most popular and practical type of wall decoration today is wallpaper, but it is often difficult to stick them, especially when the surface has previously been painted or whitewashed. Removing the old coating is sometimes laborious and time-consuming, and few people are attracted by the prospect of spending so much of their energy on rough finish if only a simple cosmetic repair was planned. In this article we will talk about whether it is possible to glue wallpaper on paint and how to do it correctly without much effort.

Determine the type of paint

In order to correctly determine how to prepare the surface for gluing, it is necessary to find out the type of finish applied to it. There are 2 types of them:

1. Acrylic water-based paint is odorless, absorbed into the walls and firmly fixed in the structure.
2. Oil paint - has a specific smell, repels moisture and forms a "protective layer".

In order to understand whether it is possible to glue wallpaper on oil paint or acrylic, you need to know what type of coating you are facing. There are several ways to do this.

Method 1

Using a spatula, try to remove part of the coating from the wall. If it is an oil coating, the material falls off in large pieces. It is quite easy to remove and does not crumble. Acrylic coating, unlike the first option, holds tight, crumbles and falls off in small pieces.

Method 2

Moisten the area with normal warm water for 15 minutes. If the surface easily absorbs moisture and is washed off with a sponge, then this is an acrylic water-based emulsion. If the water just flows off, and the coating itself has a glossy surface, most likely, you have an oil coating in front of you.

Now that we have determined what type, let's talk about how to stick wallpaper on paint, because the gluing technology depends on what we glue on.

Preparatory work

Before you start the main work, you need to carefully prepare for it. To do this, prepare:

• Wallpaper;
• Glue;
• foam roller;
• Scraper or spatula;
• hot water;
• Putty knife;
• Priming;
• Capacity;
• Putty mix;
• Sandpaper.

Important! Before starting work, assess the condition of the walls. If they are damp, dirty, covered with mold, then it is impossible to work in such conditions. Before proceeding with gluing, it is necessary to dry them, get rid of unpleasant odors. Mold is removed with the help of special tools, and its source is removed.

Choosing glue

A very important part of the work is the choice of glue, because it depends on it how firmly and for a long time they will hold. The best option will purchase glue for heavy wallpaper. Among them:

• "Bustilat";
• "Moment";
• "Methylan".

Important! Do not forget that for each type of coating there are specialized adhesives. Follow the manufacturer's recommendations.

Choosing a wallpaper

Often there is an opinion that you can choose any coating you like and glue it. But everything is much more complicated. If you have to glue wallpaper on paint, then you need to follow some rules. For example, light and thin materials are not suitable for this type of work, especially if the surface is dark. If you want to glue just such, then the wall must be carefully prepared before that. To do this, you need a special facing paper. With it, you will remove all the bumps and roughness, and also hide the color of the surface so that they do not shine through.

Important! If you are covering the walls with facing paper, it is very important that the seams of the wallpaper and paper do not match. It is recommended to glue them from the middle of the paper.

Preparing the wall for gluing

We found out that it is possible to glue wallpaper on paint, but before that you need to properly prepare the surface, depending on what was on it before the repair. Let's consider each option in more detail.

Oil paint

This paint has specific features, namely, it has a very smooth surface, which does not give the material sufficient adhesion to the wall. In order to stick wallpaper on oil paint, the wall must be prepared in one of the following ways:

1. In order for the surface to become suitable for gluing, the walls must be treated with large emery, and later apply a mixture of glue and primer with a ratio of 1 to 1.
2. The second method is less expensive and less reliable, but also has the right to exist. Namely, in order to be able to glue the wallpaper on the paint, use a spatula to remove the coating layer from the surface in horizontal stripes. Each strip should be approximately 5 centimeters wide and spaced every 20 centimeters. Next, with the help of putty, we align the wall and proceed to gluing.

Important! Sticking this type of finish on oil paint is practically no different from sticking on a regular wall, except for the adhesive. For its preparation, wallpaper glue needs to be taken 2 times more than PVA glue.

Water based paint

We have already decided whether it is possible to glue wallpaper on acrylic paint. Let's talk about how to prepare the surface for gluing. For this:

1. Prepare a mixture with the following composition: solvent plus primer in a ratio of 1 to 1.
2. Apply this mixture to the wall. Solvent will corrode upper layer water emulsion, and the soil is absorbed into the wall.
3. After the wall dries, apply the primer again to create a rough surface that will provide a sufficiently strong adhesion to the wall.
4. After the wall dries, start gluing.
5. Use a PVA adhesive and wallpaper paste in a ratio of 1 to 1.

Is it possible to glue wallpaper on paint without surface preparation?

If repairs need to be done quickly and there is no time to process the walls, there is another way out. In order to determine the strength of the walls, you will need to take a strip of building tape. Stick it to the wall and tear it off sharply. If there are no traces of the surface left on it, then the wall has passed the test, and you can glue the wallpaper on the paint. Otherwise, the coating will need to be cleaned off.

Important! In order to roughen the surface, process it with sandpaper.

Pasting wallpaper on whitewash and enamel

In addition to paint and varnish products, the wall can also be enameled or whitewashed. Let's talk about what to do with the wall in such cases.

Whitewash

If the walls have been whitewashed, then you will have to work hard, because the whitewash will need to be completely removed from them. For this:

1. Prepare a mild soap solution.
2. Apply it to the wall and let it soak in a little.
3. Remove whitewash with a spatula.
4. Wash off the residue with a sponge.
5. Check if everything was removed. To do this, run your palm along the wall. If at least a drop of chalk remains on the hand, then the wall needs to be washed again.

The second way to prepare whitewashed walls is also not easy. For this:

1. Treat the surface twice with a deep penetrating primer.
2. Then prepare the glue diluted with water in a ratio of 4 to 1.

concrete walls

Many developers and just people living in apartments often assume that a concrete wall does not require preparation before gluing. In fact, this is far from the case.

Important! Only in rare cases is it possible to do this manipulation at low humidity and in the absence of drafts. At the same time, do not forget that not all types of wallpaper can be glued directly onto concrete. Follow the manufacturer's recommendations.

In order to completely protect yourself from unsuccessful repairs, it is better to process concrete walls thus.

• Preparatory work

Wallpaper is one of the most popular and practical types of finishing materials. But for their gluing, you need to prepare the surface. Sometimes you can find that the walls are covered with old paint. How to glue wallpaper on paint? There is a way out of this situation.

Rules for wallpapering a room.

First, figure out what paint the walls are painted with.

The option of pasting the walls with wallpaper for painting.

There are several types of them. So, for example, oil has a characteristic smell and has water-repellent properties.

Acrylic water-based paint there is no smell, it also repels water well and is absorbed into the surface structure.

If you try to remove the paint with a spatula, then the oil will fall off easily, and the acrylic - only in small pieces. Therefore, the gluing technology in different occasions will be different.

Folding wallpaper for better impregnation with glue.

Tools and materials:

• wallpaper;
• glue;
• foam roller;
• capacity;
• hot water;
• scraper or spatula;
• priming;
• construction tape;
• putty mix;
• sandpaper.

Preparatory work

Often, in addition to a cracked surface, streaks and irregularities, the paint material on the walls also absorbs foreign unpleasant odors(especially in the kitchen). Please note that it is impossible to glue wallpaper on a surface that is damp or infected with fungus or mold. Process them by special means won't be enough. Be sure to find out and eliminate the cause of their appearance. You can do the following: fix a piece of rolled thermal insulation on the wall surface, then stick a plastic mesh, plaster or cover with drywall.

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Wallpapering on acrylic paint

Be sure to clean up the surface first. Otherwise, the wallpaper sheet will soon depart. It is necessary to neutralize the old coating. To do this, you can make a solution of solvent and primer, mixed in equal proportions, and treat the walls with it. These manipulations will ensure good adhesion of the future wallpaper to the wall surface. Wait until everything dries well, and then coat the walls with a primer.

Leave the wall to dry and only then proceed with wallpapering. To do this, mix PVA glue and wallpaper in a 1: 1 ratio. Apply the resulting composition to the sheet and the prepared wall surface.

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How to stick wallpaper on oil paint

Self-pasting the walls with wallpaper - stage 1.

You can glue wallpaper on oil paint. It has good grip and a very smooth finish. This is what creates difficulties for the necessary adhesion of the canvas to the wall. Therefore, before gluing wallpaper on oil paint, thoroughly treat the surface. In this case, you can resort to one of two options. The first is that the wall needs to be treated with coarse-grained emery, then a primer and PVA glue mixed in equal parts are applied to it.

The second way is as follows. With a spatula, remove the paint in horizontal stripes 5 cm wide every 20 cm, and then apply putty to these places to align them with the entire surface. Stripes are necessary for better adhesion of the wallpaper to the walls. This method is less effective, but is sometimes used.

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Sticking on paint without surface treatment

Self-pasting the walls with wallpaper - stage 2.

In this case, you first need to check the walls for strength. To do this, take construction tape, stick it to the painted surface, then sharply tear it off the wall. If you see that the paint remains unchanged on the wall, then it has passed the strength test. But if you find particles of coating on the adhesive tape, then it will need to be cleaned off.

This takes time, so please be patient. To clean the surface, you will need a spatula, you can use a special metal brush mounted on a drill. Solvents are undesirable because of the toxic effect on the body.

In the first case, you can glue the wallpaper without surface preparation, since the coating has formed a smooth and durable surface. To roughen the surface, it is recommended to sand the wall with sandpaper. Please note: thin wallpaper light shades do not glue on a dark finish, as it will show through the new finish, and this looks very ugly.

Self-pasting the walls with wallpaper - stage 3.

General wallpapering technique

1. When choosing wallpaper, keep in mind that if there is a pattern on the rolls, it will need to be docked. Buy with a margin of 1 roll. Before gluing wallpaper onto paint, read the manufacturer's instructions for diluting the adhesive thoroughly and strictly adhere to them. Do not use glue that is not suitable for specific wallpaper.
2. Wallpaper must be glued from the window. It is advisable to work with an assistant. After cutting off the strip, lay it on the floor upside down. Spread the glue evenly over the strip, then lift it up by folding the edges of the sheet together. Wallpaper is glued on top. Align the canvas with the ceiling and attach to the surface. Press the sheet well from the middle to the edges and down. It is advisable to use a rag or roller. You can use a rag to remove any remaining adhesive.
3. Switches and sockets are glued on top, but immediately cut through.

Under the windows and above the door, the wallpaper is pasted after the whole sheets are pasted. Never use hot glue. It acquires a liquid consistency and goes beyond the edges, staining the front side of the canvas.

If you have figured out well how to glue wallpaper on paint, you can safely put your knowledge into practice. Having done all the work with maximum responsibility and accuracy, you can get a result that will delight you and your family members for many years.

wallpaper like finishing material, in wide use appeared in the second half of the twentieth century and since then their popularity has only grown. For repairs on hastily" this is best option. But in old houses sometimes there are painted walls, and many are interested in how to stick wallpaper on paint with their own hands so that they hold securely.

The classic instruction says that under the wallpaper or under the putty, the paint must be removed completely. But from experience, we can say with confidence that the wallpaper on the paint holds well, only before sticking the wallpaper on the paint, the surface must be prepared in a certain way. There are several ways to prepare, and each of them is quite affordable to do it yourself.

Decide on the type of paint

• The first thing to start with, before gluing the wallpaper on the paint, is to determine what kind of base you got. Because different surfaces are prepared differently.
• To begin, moisten a section of the wall or ceiling with plain warm water and leave for 10 to 15 minutes.. If the surface has absorbed moisture, it is easily washed off with a sponge or, then you have water-based paint.
• If water flows off the wall without lingering, the coating has a durable glossy surface and when you try to remove it with a scraper or spatula it breaks off in whole pieces, then you got a wall painted with oil paint or enamel.
• These 2 reigned supreme in the last century and, as a rule, they will be on the old walls. As for modern paints, such as acrylic, alkyd, Zinga electrically conductive paint or Polysteel fire retardant paints for metal, the approach should be somewhat different here. But first things first.

• When choosing and buying wallpaper, one should take into account the fact that a canvas with a clear pattern will need to be combined. In this regard, the consumption will be slightly higher, on average by 10 - 15%.
• Of great importance is the selection of glue, we advise you not to philosophize and take glue for this type of wallpaper. Otherwise, the canvas will not hold securely or, on the contrary, will stick tightly, which will create serious difficulties for you during the next repair.
• Work starts from the window and further along the perimeter of the room. You can glue alone, but it’s still more convenient and easier to work together, especially if you need to combine the pattern. The first strip is checked by a plumb line.
• We recommend immediately spreading glue on several pre-cut strips so that the glue does not dry out, fold the strips on both sides, from the edges to the center. It is best to spread with. Thus, the canvas will be saturated with glue and lie well.
• After docking, you need to level the strip and expel air bubbles with a soft rag or roller. The adhesive protruding along the edges is wiped off immediately with a soft, dry cloth.

Works on water-based emulsion

• Next, we'll talk about how to glue wallpaper on water-based paint. This type of coating does not have a strong, sealed film on the surface and absorbs moisture well. If you try to glue immediately on a water-based emulsion, then it will draw moisture out of the glue and the canvas will fall off. Therefore, old washable water-based formulations must be removed completely.
• The most elementary way is to wet the wall and after 15 minutes wash it off with warm water or scrape it off with a spatula. But you can do otherwise. The surface is wetted with water, after which the paste is applied, when the paste is completely dry, you just have to scrape it off the wall with a spatula and wipe it with a damp cloth. With this approach, there will be much less dirt.
• But now, especially on ceilings, water-based acrylic or alkyd paints are common. In some sources, they are also called water-based. But water will not take them, a different approach is required here. Before sticking wallpaper on water-based paint with acrylic or alkyd filling, the wall is covered with a special solution.
• The preparation instructions are extremely simple, the solvent and primer are mixed in a 1: 1 ratio. It is better to take a solvent special for this type of composition, the soil is selected depending on the type of base. The solvent will partially corrode the surface and allow the primer to penetrate deep into the wall. After the wall is completely dry, wallpaper can be glued onto it.

Oil paint work

• The question of how to glue wallpaper on oil paint is also relatively easy to solve. The fact is that oil paint is a fairly strong coating, in old houses it can be applied in several layers, it can be problematic to remove it. Before gluing wallpaper on oil paint, the surface can be treated in 2 ways.
• First, we will talk about a simpler and optimal, in our opinion, method. If the paint layer has eaten in tightly, you do not need to overexert yourself trying to scrape it off. In this case, you should take sandpaper with a large grain and clean the wall well, to a matte state.
• After that, a special solution is prepared, the primer is mixed in equal proportions, for this type of wall, with PVA glue. This composition is applied to the surface and left to dry completely. After that, you can start gluing.

Tip: if there are small scratches, chips or bumps on the wall plane, then it is better to use thick, heavy vinyl wallpapers.
Their price is slightly higher, but with their help you can hide all the defects and do without putty.

• But the layer of oil paint does not always hold firmly, in this case method 2 is suitable. Before sticking wallpaper on oil paint, we advise you to tap the wall for voids and try to scrape it off with a spatula. If the coating is removed in fragments, the masters advise to arrange these fragments. That is, not peel off the entire wall, but only scrape off horizontal stripes 50 mm wide, with an interval of 200 mm.
• Next, the strips are primed and puttied so that the surface is even. As a result, we get even stripes of putty, on which our wallpaper will hold. Some craftsmen advise something in between, putty what has been torn off, then sand and cover with a mixture of soil and glue. Each of the above methods deserves attention, and which one is closer specifically to you, decide for yourself.

Tip: when working on oil paint, in order for the canvas to hold more reliably, experienced craftsmen advise adding a little PVA to the wallpaper paste. Depending on the density of the canvas, it can be diluted in a ratio of 1:3 or 1:5.

The video in this article shows general principle wallpapering.

Conclusion

In conclusion, I would like to note one more important detail. Regardless of the basis on which you glue the wallpaper, from the time you started work until the time when the walls are completely dry, the windows should be closed in the room and there should be no drafts. Otherwise, no matter how hard you try, the wallpaper will fall off.

If you need to quickly make repairs, and there is no time or opportunity to remove the old finish, in such a case you need to know for sure whether it is possible to glue wallpaper on paint and how to do it correctly. Let's look at different situations and existing solutions for each.

There is such a thing as redecoration, when you just need to refresh the atmosphere, change the look of the room, while applying a minimum of effort or time. The expected arrival of relatives for a long time can induce such a decision, or you need to have time to make a new finish in the nursery while your beloved children are visiting their grandmother. The need to paste over the walls with minimal labor can only be due to individual capabilities, for example, if there is no man in the house who can start a full-fledged repair. After all, if the paint adheres well to surfaces, it is very difficult to clean it.

Sometimes you just need to freshen up the situation, change the look of the room, while applying a minimum of effort or time.

Another reason is the unwillingness to receive mountains of construction waste during the renovation of the premises. It doesn’t matter what the prerequisites are: the presence of small children in the house or an abundance of pets that have nowhere to take out for the duration of the repair. It's no secret that it's a lot of dirt and dust. Wallpapering once painted walls will help to avoid the appearance of garbage, which would inevitably have to be taken out after the repair. However, such a development of events is possible only on the condition that the old coating adheres well to the walls, otherwise unreliable areas will have to be cleaned.

There are several problems that one has to face when trying to decorate a room with wallpaper over paint. The first and main one is the unknown composition of the previous coating. That is, you can’t always say for sure what exactly the walls were painted in the distant past. And not every paint makes it easy to stick a heavy panel of wallpaper. In particular, some peel off easily under the weight of the additional coating. Therefore, before sticking wallpaper on painted walls, you need to do a little research on the finish for its durability. To do this, try to scrape off a small amount of paint (this area can be smoothed out later with putty). If the layer separates easily, you should not even think about gluing.

There are a few problems that one has to face when trying to decorate a room with wallpaper over paint.

The second problem that can be encountered is stubborn dirt, and sometimes soot, greasy stains. Some types of paints are very easy to get dirty, especially if the coatings are not washable, that is, moisture resistant. In this case, any splashes are easily absorbed into the surface layer, after which it is no longer possible to clean them. Especially often this picture can be observed in the kitchen. It is impossible to glue wallpaper on grease or dirt, in this place the new coating will definitely peel off, so the contaminated areas will have to be cleaned off the walls, then smoothing out the irregularities with putty. If the contamination is not organic, not greasy or oily, you can try using a deep penetration primer.

And finally, another, less common problem - foci. At high humidity and condensate settling on the walls (if the walls are not properly insulated), you can notice wet spots on the paint, which are sometimes accompanied by mold. Of course, it is impossible to glue wallpaper in this case. To start repairs, it is not enough to get by with just one treatment with antiseptic preparations. It is necessary to eliminate the root cause of the appearance of the fungus, which means to carefully insulate the wall, outside or inside, in the second case using rolled thermal insulation and any suitable rough sheathing - for example, drywall.

Wallpaper over water-based paint - how realistic is it?

Among other types of finishing, mixtures diluted with water before applying to walls are considered the cheapest. At the same time, it turns out quite beautifully, although without any special effects. However, the durability of such paint is low, and therefore any negative factors, such as temperature extremes and high humidity, can lead to the fact that the finishing layer simply begins to crack and fall off. If you do not want to peel off the paint from the walls before hanging the wallpaper on the paint, you need to fix the coating. To do this, take with increased adhesion and a solvent, mix their equal parts and apply on the old finish, without missing a single centimeter of the surface. The solvent will slightly loosen the structure, and the primer, having penetrated the entire thickness, will bind the paint particles and strengthen it on the walls.

In some cases, the lagging water emulsion will have to be carefully removed with a spatula, wipe the edges of the area from crumbling particles and cover with putty.

If necessary, you can (and often even need to) repeat, but without a solvent and only after the first treatment has dried. As a result, you will get a somewhat rough and very durable surface, with which the adhesion of the adhesive will be perfect. Next, be sure to wait for the complete drying of the applied composition, since the wallpaper does not fit well on wet surfaces. To fix the wallpaper, it is advisable to add ordinary building PVA to the special glue in a 1: 1 ratio, and the mixture must be applied not only to the prepared canvas, but also to the wall section.

If the walls in any room were painted with enamel, following the example of student dormitories, this option is the optimal basis for wallpaper. The fact is that with proper preparation of the walls, this type of paint is extremely durable, while providing good adhesion to the applied wallpaper glue. But first it is advisable to make sure that the old coating is really reliable, for which you need to try to scrape off a small amount of paint in a secluded place. If the walls have been painted for a long time, and the coating peels off easily, then you will have to clean off all unreliable areas, but if you manage to beat off a fragment of the layer only with gentle blows, you can safely proceed to gluing.

If the walls were painted with enamel, this option is the best basis for wallpaper.

But whitewashing is considered, on the contrary, the most unreliable basis for wallpaper. The fact is that it is easily showered with individual particles, which is the cause of soiled hands and clothes when touching the finished walls. If you do not want to wash the walls for a long time and thoroughly, do the same as recommended above for water-based paint. Prime the walls twice with a deep penetrating compound, but without adding a solvent, and be sure to let the applied primer dry each time before proceeding with the next impregnation. But this is only the first step. Now you need a water-based wallpaper paste, knead it and completely cover the walls with it, let it dry, and only then you can start pasting.

Oil and acrylic compositions - their suitability for wallpapering

Now let's find out if it is possible to glue wallpaper on acrylic paint. This type of coating is a dense elastic film that adheres very well to rough surfaces. At the same time, it is practically pointless to use impregnations, since often the acrylic coating has water-repellent properties. The same applies to putty, if you suddenly decide to pre-treat the surface with it and then paste over it. However, you should first find out if acrylic paint is getting wet from water or adhesive composition, for which we recommend treating a small area where it will not be noticeable.

Pay attention to the color of the painted surface - whether it will show through the wallpaper. If necessary, paint the walls in the desired color, and only then, after the secondary finish has dried, glue.

As for oil paints, they always adhere very well to the walls, but the adhesion of their surface after drying is extremely low. The point is the smoothness, even the glossiness of such a coating. The most reliable adhesion to glue can be only in one case - if you pre-treat the walls with sandpaper with large grains, for which a special grater is used. Then you need to treat the surface with a deeply penetrating primer mixed with PVA glue in equal parts. In this case, the adhesion of wallpaper glue will become acceptable, and you can start decorating the room with wallpaper.

The decision to use wallpaper as wall decoration or flow has been considered justified for many years. This option was resorted to many centuries ago, and is being resorted to now, since the modern building materials market offers a huge range of them. But there are certain requirements for the gluing process itself. Since the wallpaper is glued, it is necessary that the surface on which they are glued has good adhesive characteristics.

Therefore, the question of whether it is possible to glue wallpaper on oil paint is still relevant today. Let's start with the fact that when applied, oil paint is well absorbed into the treated surface, even if it was applied in several layers. The surface of such a painted surface is glossy, so the wallpaper does not stick to it. Experts advise getting rid of the surface painted with oil paint by any means. The most ideal option is to remove it with sandpaper or a special brush head that is put on the drill chuck. Of course, after such an operation, the wall will have to be leveled and prepared before wallpapering it.

But imagine that it was decided to glue wallpaper on a large area. This suggests that the same area will have to be cleaned of oil paint. It's long, it's not easy, it's dirty and dusty. Are there other options? Yes, and there are two of them. True, even in their case, you will have to prepare the surface, and then glue the wallpaper on it.

Option number one

This is the easiest option. To do this, it is necessary to sand the surface of the wall painted with oil paint with coarse sandpaper. After that, it is treated with a mixture that includes PVA glue (50%) and a primer (50%). The primer is absorbed into the exposed sections of the wall, forming a bond with the mixture. PVA glue clings to painted areas. At the same time, a thin layer of adhesive composition covers the entire wall, turning its plane into a platform with a good adhesion index. Such a finishing layer dries for at least a day. After that, you can proceed to the main process.

Option number two

This is a more complex technology, because you will have to strictly adhere to a certain distance between the areas that open between the paints. To do this, you need a spatula, which needs to remove vertical sections of paint in the form of stripes 5-6 cm wide. The distance between the stripes can vary in the range of 20-25 cm.

By the way, it is not necessary to remove the paint layer with a spatula. As practice shows, if the paint is attached to the wall tightly and tightly, then tearing it off without damaging the wall itself will be very difficult. Therefore, you can use a drill with a nozzle. A metal brush will only remove a layer of paint and go a little deeper into the body of the wall. After that, these strips are filled with putty mortar to the level of the plane of the painted surface. And then, as usual: the putty is skinned, treated with a primer. It is possible not to sand if thick wallpapers are pasted.

Attention! If non-woven or vinyl wallpaper (thick and dense) is chosen for wall or ceiling decoration, then there is no need to repair and level the walls. They will close all minor defects and differences.

Other options

Home craftsmen are experimenting all the time, finding quite original and simple solutions. So it is with how to glue wallpaper on a wall with oil paint. For example:

The second option is usually used if the old paint is not in very good condition. Weak unreliable areas will have to be beaten off or removed with a spatula. After that, a material such as Betokontakt is applied to the entire surface to be trimmed. This is, in fact, a liquid primer, which includes quartz sand. After drying, a layer with a high adhesion index will appear on the surface. At the same time, the primer applied to the surface to be treated does not absorb the moisture of the wall, which makes it possible for it to dry evenly, without cracking or flaking.

In the event that liquid wallpaper is applied to the wall, then the surface must be washed or cleaned well, apply "Betokontakt" (you can use a primer for liquid wallpaper), and only then boldly apply the finishing material. Of course, the condition must be observed that the paint itself lies securely on the wall surface. At the same time, it is necessary to remove all nails and screws from the wall before starting work, and it is better to paint over metal mortgages, on the contrary. The goal is to prevent rust from appearing, which will definitely appear on the surface of the liquid lining.