How To Prepare The Walls Before Painting

Four easy steps to prepare and clean a masonry, cement or board wall, whether it is new or with old coats, all before the application of the new paint.

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Here are some steps to prepare the wall before painting. In the first steps it is contemplated that the surface has old paint coats. If that is not your case or the wall is new and in good condition, go directly to point 3.

1- Remove loose paint and mold

On previously painted surfaces, you will have to start by removing the paint that is not adhered . Carefully remove with a putty knife so as not to cause further damage to the wall. You can then sand with a fine sandpaper (120 to 200 grit) to smooth and even the edges.

Another common problem is mold , which can re-sprout after applying the paint, so it is essential to eliminate it before you cause problems. The mold on the walls is often caused in areas with low humidity and ventilation. And it disappears easily when washing with a damp cloth with bleach or bleach, always allowing the area to dry properly before painting.

2- Repair holes and cracks

It is very difficult to find a wall in perfect condition. There are always small nicks, scratches and cracks  that will not favor good looks, and will be more noticeable if you paint with a satin paint , for example.

If you are a perfectionist and you want to erase these marks, you can do it with plastic filler or some putty for walls (interior or exterior, as appropriate). A flexible spatula or trowel will work as a tool, plastic ones are very suitable. Remove all excess material before it dries, and once it has completely dried… sandpaper to smooth and level the surface.

3- Sandpaper (only if necessary), dust and clean

You should only sand if the wall has previous hands, or if it is a fine cement plaster. Sanding will create a recoatable surface over the previous coat of paint , and will remove the grain of the sand used for plastering. Never sand on drywall or plasterboard , except at the joints and where putty has been applied. In these cases the surface is already suitable for painting.

Whether you have sanded or not, you should always clean to remove all traces of dust that could harm the adhesion and good finish of the next coats of paint. For this use a brush or fine bristle broom, to finish, go over it with a dry cotton cloth.

4- Apply a sealing primer

Using a fixative or sealer, also called a wall primer , has its advantages. It mainly seals the wall so that it absorbs less paint, covering the previous color better and spending less. That is why the application of sealant is essential in new walls , in crack repairs, and in walls that have not been painted for a long time.

The sealant is used the same as paint, with a brush and roller, diluted according to the instructions on the container. Let dry the necessary hours before the first coat of the final product.

If you have followed the steps, everything is ready to paint the walls with the color you want, and with the most suitable paint. Preparing the surface can be a cumbersome and undesirable task, but it is necessary for the best result.

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