When you decide to paint a wall or any other type of surface, you must take into account the realization of a previous process with the main objective of being able to prepare the place to be painted in order to obtain in this way best results. In addition to cleaning the surface that must be carried out, it is important to carry out studies on the nature of the same, thus finding out if the priming process is necessary.

What is primer?

Primer is a type of coating that is placed on a surface previously before placing the paint using a product similar to it but that does not give any type of final finish .


Primer characteristics

We could say that the primer is the application of a certain liquid product on a surface that needs or wants to be painted. It is a type of coating that is placed before in order to give the guarantee that the paint will remain intact and in good condition for a long time. It can be made using different types of solvents or water .


In the case of wood, the primer is also known by the name of sealer , which can be used to cover pores (seals and protects the wood, resulting in a varnish-like finish), colorless (it works on all types of wood that is located on the outside as it seals it and prevents the formation and growth of fungi and insects such as termites) and the pigmented sealer (it seals all the pores of the wooden surfaces so that the paint can later be applied evenly.

It is also characterized by having the ability to deliver a good finish at the end, the paint adheres much better to the surface when the technique is used, provides strength and effectiveness to avoid corrosion processes and can hide very effectively all those imperfections that may exist on the surface. It dries very easily and after it is applied, the pieces can be enameled, varnished or painted according to the taste of the person who needs it.

The primer can be white for light colors, black when you want to darken the tone that the color will have at the end, gray when the tones will not be very dark but they will not be too bright and, when several color tones are going to be used then , the primer should ideally be white or gray in color.


Experts consider that the origin of the primer dates from the 16th and 17th centuries and that it had its origins in Spain . The introduction of the use of fabrics for paintings led many artists to seek new ways of being able to protect the surfaces where they would carry out their works. In the middle of the 16th century, they began to look for means that would allow a good preparation of the canvases and in this way the primer originated as a layer that would be in direct contact with the paint and that also allowed the drawings to have better degrees of Colour.

What is it for

Primer is a method that has different uses. Basically this is a process that serves to prepare the surfaces before they are painted, either because some kind of repair is needed or because the material, before being painted, needs to be treated. In the case of being applied on a wooden surface, it serves to be able to seal the entire piece so that the paint can adhere in a better way. When used on pieces of wood, it helps prevent them from rusting or corrosiondamage them. On concrete or plaster, for example, primer is an excellent medium to help preventStains and mold as it works very well to prevent and protect surfaces from moisture.

Types of primer

There are several types of primer, each of them has different functions and for this reason they are not the same. The surface where the paint is to be placed must be studied very well to determine the type of primer necessary. These types are:

  • Primer with a solvent base , which in other words means that it will be diluted using a solvent.
  • A water-based primer , which you will dilute using only water.
  • Primer for wood that can be pigmented or plug pores.
  • Primer for metal surfaces .
  • Primer for walls and ceilings .
  • Primer for plasterboard or cardboard .


The main methods to be able to carry out the priming process are the following:

  • A la creta : this method is done in plaster, no oil is used and has the ability to provide very bright tones. It is the most used by painters because it is very practical.
  • Medium chalk : it is used especially on more rigid substrates, it should be left to rest at least 12 hours before applying the paint.
  • Oil: this is the type of primer that is used when painting in oil as it is very easy to apply and consists of placing a primer cream that has more linseed oil.
  • To casein : Casein is a type of milk protein and is used for painting. When placed for the priming process, very similar results are obtained later than watercolor. In this case, the casein acts as a type of glue and therefore the base must be a hard surface.
  • Acrylic : This is very easy to apply and prepare and gives very convenient results. Can be used with all water and oil mediums. It is widely used before doing decoupage type work.

Explanation of the process

To carry out the priming process, the first thing to do is repair the wall in case it is found or presents any type of damage. All traces of paint or scraps of paper that are still adhering to the surface, or in case there are coating challenges, these should also be removed . Subsequently, you must proceed to clean the wall very well. Once clean, the first coat of primer will be applied using a roller and should be allowed to dry very well, preferably following the manufacturer’s instructions. Finally, a coat of paint is applied with a brush or a roller depending on the extent of the surface.

On which surfaces the primer should be applied

Priming is a process that can basically be applied to any type of surface that needs to receive layers of paint. However the most common are the wood , the concrete , plaster , the tiles of ceramic , the PVC and metal , such as in the case of aluminum.


This technique is of utmost importance in art because it is through it that professional results can be obtained . It helps to seal the paints, to give a finish that has greater smoothness and is also more even and gives the assurance that there is a better adhesion between the top coat and the surfaces that are being painted.

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