Preparation of Walls Before Painting

Preparation of Walls Before Painting

Experienced painters seem to agree that painting walls will take three-quarters of their time to prepare. This is not a matter of accident for the substrate – once it has accumulated or swelled, the paint can only accentuate the roughness and the surface may start to crumble or bounce. What steps to take and who to focus on.

Surface cleaning

If the walls have been previously painted, you may need to remove the former coat of paint. True, it depends on the type of paint and its quality. If the paint adheres well to the wall, it is not necessary to clean it. On the other hand, the surface must always be cleaned of any dirt that prevents further coatings of paint or primer from sticking.

The walls of residential or office buildings are often painted with water-based paint. In this case, clean the walls clean with dirt or grease. Some types of paint are less “friendly” to new coatings. “If you are going to paint an old staircase that used to be oil painted, you should clean it. Oil-alkyd paints are non-breathable and have poor adhesion. Chemical agents, special paint softeners to cover the surface, may be used. After a while, the paint softens and can be scraped off with a spatula. However, one of the simplest tools is a simple sanding of the surface. Only glossy surfaces are required for spitting.

If your room has been renovated a very long time ago and you are not sure what paint the walls are painted on, you can take a few tests to help determine the condition of the coating. “You need to dampen a small area of the wall and see if the paint overheats. If they absorb water, they are well visible – the paint has to change color and darken. In this case, either blocking primers will have to be used or it is best to remove such paint.

In the past, the walls used chalk or water emulsion paints that were low in a binder. To check how old paint “sticks” to the wall, the interviewer suggests the following test. “Take the painter’s tape, stick it on the wall, leave it on for a day, then peel it off with a sudden motion. If there is no paint left when you peel it off, you can remove dust and repaint the surface. If there is a need to level the walls, a primer can be used under the putty. If there is no such need, you can simply paint on the top.

Before painting, priming or painting, be sure to inspect the walls thoroughly for mold. If mold is one of the reasons you refurbish your walls, remember that it is not enough to remove it mechanically – without action to reduce humidity and improve indoor ventilation, the mold will eventually return.

Although the wall is usually primed just before painting, it is possible to primer the wall as required and also before the application. The primary purpose of the primer is to equalize the absorbency of the surface. “If the surface is porous or has been plastered with lime, applying moisture or paint to the surface causes the moisture to enter the substrate, allowing the new layer to dry but unable to harden and stick. It all depends on the surface as it is. Next time, it is not even necessary to primer before painting.


In old-fashioned homes, the walls are often extremely uneven. Very large unevennesses are smoothed by plastering, smaller unevennesses and various abrasions, scratches, porous surface of the plaster and other things with putty. The putty may be dry, you will need to prepare it yourself, or it will be ready for use.

There is no need to scrub the plaster on the plaster. Apply as many coats as necessary to achieve the desired wall smoothness, usually up to 4 times. When the putty dries, it is sanded with a fine grid. A considerable amount of dust builds up during this process. Dust should be removed by wet cleaning with water and a sponge, frequently rinsing. However, keep in mind that it should be slightly drained, otherwise you risk losing some of the putty. The main purpose of such a process is to collect dust. “A common mistake is to use a deep primer to bind the dust. If you want the preparation surface to be clean, it is best to clean it with a damp sponge, not deep soils, when unnecessary material is added and labor costs rise. ”

Primers trap residual dust, but in this case, this process would leave a porridge-like surface on the walls, which is not the best option before painting.


If the surface you are painting on is evenly absorbed, or if you have a latex or polymer coating, you may not need a primer – you can apply it immediately. Otherwise, primer. The primary purpose of priming is to ensure that the paint adheres well to the walls, which determines the quality of the primer. Priming can be done by brush or roller. When the primer dries, you are ready to paint, but this is a case where you are incredibly successful. Priming usually also shows defects and will almost inevitably require repair. The standard paint serves only a decorative function, so the installation of the undercoats requires high quality.

When choosing primers, you will certainly find a group called deep soils. Their joints are very fine grains, so they easily absorb into the porous wall substrate, consolidate bulky surfaces and evenly absorb the wall. In addition to submersibles, primers can be reinforcing. Such primers reinforce the top layer of the wall. True, specific primers may still have their own requirements. “The subsoil comes with an instruction book that tells you what paint to paint on.

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