How to properly glue wallpaper on water-based paint step by step and is it possible

Before starting the repair, it is important to find out whether it is possible to glue the wallpaper on oil or water paint. Indeed, the lifetime of the bonded material depends on the state of the surface and on the coloring composition previously applied. It will be problematic to stick wallpaper on a perfectly flat and smooth wall. Before gluing, it is desirable to roughen the surface. The ideal option is to dismantle the old coating.

How to determine the type of old paint composition

Usually the walls inside the premises are painted with an aqueous emulsion, an aqueous dispersion, lime, less often - oil, silicone, alkyd, latex paint. Before gluing the wallpaper, it is advisable to determine the type of the old coloring composition. The cover may need to be removed.

Oil paints, alkyds and other resin-based paints usually have a perfectly flat, smooth and shiny surface. Any of these compounds, after being applied to the wall and drying, forms a hard film that does not penetrate the plaster, but remains outside.The coating may crack and peel over time. It is problematic to glue wallpaper on such a coloring composition.

Smooth surfaces have poor adhesion. Old paint is separated into layers, layers, tears well. To dismantle the coating, special chemical softening agents (strippers) are used. Old paint can be removed mechanically (with scrapers, wire brush).

If the walls are painted with a water-based composition or an aqueous dispersion, then a layer of paint that has penetrated deep into the base cannot be torn off in layers. The old coating under mechanical stress (scraping) peels off in small dry pieces, flakes, dust. The plastered wall is impregnated with an aqueous emulsion. You can dismantle such paint by simple rinsing or mechanically (with a scraper, sandpaper).

Rules for choosing the right type of wallpaper

Usually the wallpaper is chosen according to the style of the room, the area of ​​the room, the colors and patterns you like. If the old coloring composition is not suitable for gluing, then it is dismantled or brought to the desired state. You can glue any wallpaper on the wall, the main thing is to properly prepare the surface for gluing.

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A few tips that will be useful when choosing the materials to be bonded:

• thick wallpaper canvases are not glued to the oil-painted surface;
• on a flat plastered surface, paper, vinyl, non-woven, textile wallpapers can be glued;
• for a wall with slight irregularities, liquid and textured (textured) wallpaper is suitable.

How to prepare the surface before bonding

The wallpaper is pasted only on the wall prepared for pasting.Ideally, the surface is plastered with gypsum plaster and primed before gluing. If there is a previously applied paint composition on the wall, it is advisable to dismantle it.

Surface cleaning

Before gluing, the wall is cleaned of cracked paint, dirt and dust.To clean the surface, use construction tools (scrapers, spatulas, brushes), detergents and chemicals. It is advisable to clean the walls with a respirator and goggles.

Oil compositions are removed using special reagents or mechanically (metal brushes, scrapers). If the paint adheres well to the wall, you can leave it. True, the surface will need to be sanded. A wall suitable for wallpapering should have roughness.

Aircraft check

After cleaning, the wall is checked for cracks, irregularities, dents, holes, chips. The inspection is done by day with good lighting. It is recommended to paste the wallpaper on a perfectly flat surface. Paper or non-woven materials are not able to hide all wall defects.

Put and level

Defects in the walls are eliminated with putty. It is recommended to paste the wallpaper only on a perfectly flat surface. Putty solution is applied to places of cracks, holes, depressions with a spatula. Previously, putty areas are treated with a primer. If a large area needs to be leveled, it is advisable to purchase gypsum plaster and plaster the wall.

Padding

It is recommended to prime a perfectly clean, dry, flat and rough wall before wallpapering. For this you can use a primer, brush or roller. The primer is a special odorless, transparent or white liquid. After application, dries in about 24 hours.

After priming the surface of the dry wall, you can walk again with fine-grained emery paper.

If the base to be glued has already been painted in bright colors, it is recommended to purchase a white primer that will cover the colored base. Each type of wall and wallpaper has its own type of primer. Impregnation allows materials to be quickly and firmly attached to the wall surface. The primer improves the adhesion of the wallpaper to the wall. It is impossible to perform gluing bypassing the surface primer.

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Types of wallpaper primers:

• PVA-based primers - suitable for paper, nonwovens and vinyl materials;
• latex primer - used to strengthen a crumbling base;
• antiseptic primers for wallpaper - contain antibacterial and antifungal substances;
• wallpaper paste containing soil - a universal composition that shortens the procedure for preparing for gluing;
• acrylic primer - penetrates deep into the plastered wall, improves adhesion;
• alkyd primer - applied to wooden boards, prevents wood swelling.

Some primer manufacturers recommend priming not only the walls, but also the wallpaper. There are wallpaper materials for painting. Before applying the paint, the surface of this wallpaper must be primed. Impregnation is applied to the base in two layers.

Paste technology step by step

The stages of the wallpaper:

1. Rough the cleaned wall.
2. Prime the surface and dry well.
3. Cut the roll into strips equal to the height of the wall or the length of the ceiling.
4. Prepare an adhesive composition.
5. Apply glue to the wall or to the wall and the inside of the wallpaper (depending on the type of wallpaper material).
6. Paste wallpaper on the walls (starting with the corner or the window).
7. Smooth the surface with a dry roller, starting from the center, in different directions.
8. Wipe off the remnants of the displaced adhesive with a clean cloth.

There are several nuances that should be paid attention to. Before pasting thick wallpaper on the wall, it is recommended to glue special paper or ordinary old newspaper in advance. The glue is applied to the canvases by roller or brush. The adhesive composition must saturate the support of the wallpaper. The impregnation lasts 5 to 10 minutes. Wallpaper canvases are glued end to end or overlapped.

If the strips are not glued smoothly, the error can be corrected before the glue dries. It is advisable to dry the room covered with wallpaper with the windows closed and the doors open. In a draft or in high humidity, the canvases can move away from the wall.

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What to do if the paint did not pass the test

It is advisable to dismantle the old coloring composition from the wall before gluing. The wallpaper canvases fit perfectly on a rough, primed surface. If the paint is not removed from the wall and the base is not primed, there is a high probability that the glued materials will fall off. In this case, you will have to redo the repairs and glue on the part. Usually, surfaces painted with oil or alkyd paint do not withstand the test. Smooth substrate has poor adhesion.

It is recommended to remove the fallen wallpaper from the wall. The back of the canvases should be thoroughly cleaned of adhering paint, plaster and dust. It is recommended to pay special attention to the walls. They must be thoroughly cleaned of the old chipped coating.To remove the coloring composition, use chemicals (washes) and detergents.

The paint is removed with a spatula, a scraper, a brush. After removing the old coating, it is recommended to level the wall with plaster and prime it. After preparation and cleaning work, you can start gluing.

What to do if the paint turns out greasy

In old Soviet buildings, the walls are usually painted with oil paint. Over time, a smooth, shiny, even surface begins to crack, peel, swell. The only way to make the walls presentable is to dismantle the old coating. However, it takes a lot of time and money to remove the previously applied coloring composition. You need to buy a liquid (stripper) to remove the paint. After dismantling the old coating, you will need to level the walls with gypsum plaster. Immediately before gluing the wallpaper, the surface should be primed and dried well.

You can take a shortcut: leave the oil paint on the wall, but go over it with sandpaper or a wire brush. The surface to be bonded should become rough. At the final stage, the walls are treated with a primer and sanded again.

Wallpaper can be pasted over the oil-based paint composition. True, the wall must have a perfectly flat surface. The base must first be roughened. If the wall is uneven, with defects, and the paint is crumbling, swelling, then it is better to first remove the old coating and level the surface. It is important to remember that the wallpaper can only be pasted on a flat, rough surface. Before gluing, the wall must be treated with a primer.