Think primer is useless, don't want to use primer?

Recently, I found that some owners didn't want to buy primer when buying latex paint.
They felt that it was useless and only needed to apply topcoat.

In fact, this is a wrong idea.

Question: Have you ever encountered latex paint being absorbed by the wall too quickly when painting the wall? Can't the amount of latex paint be applied to the reserved area? Discoloration soon after painting, and even paint film peeling, lumps, mildew spots, etc.
, which often make us feel headaches and helpless?

Then the editor is here to tell you that these problems are because you did not use primer!

Because whether it is a new wall or an old wall in the room, there will be alkalization problems due to excessive moisture, especially in a humid environment.
This is the root cause that affects the quality of the com" href="http://">paint coating online coatingol.
com .

Primer is very important.
Primer is the first layer of the topcoat system.
It is used to improve the adhesion of the topcoat, increase the fullness of the topcoat, provide alkali resistance, provide anti-corrosion functions, etc.
, while ensuring the uniform absorption of the topcoat , To make the topcoat system play the best effect.

The function and benefit of applying primer:

1.
Sealing: Some walls are relatively alkaline.
After soaking in moisture, water, etc.
, alkali blooms will be produced.
The scientific name is "efflorescence".
This situation causes the formation of crater-like protrusions on the surface of the paint film.
A layer of alkali frost will eventually destroy the paint film.
The latex paint primer can play a sealing role and alleviate this situation.

2.
Adhesion: The emulsion content in the primer is higher, and the adhesion is stronger.
It can improve the bonding force between latex paint film and wall.

3.
Filling up: If your wall is not alkaline and relatively flat, you don't need to use primer, of course it is better to use it.

Applying a layer of sealing primer before applying the top coat can not only save decoration costs, but from the long-term and decorative effect, applying the primer has the advantage of getting twice the result with half the effort.

At the same time, the good adhesion of the primer makes the wall smoother, makes the topcoat easier to apply, and reduces the amount of topcoat used.
In this way, the wall surface not only avoids paint disease, but also helps to maintain the painting effect for a longer time.

Under what circumstances should the primer be used?

The design goal of the primer is to adhere to the surface of the base layer and form a bonding layer with the topcoat.

Primer is usually used to paint on porous substrates, such as concrete, especially wood.
If the base layer is not waterproof, a primer is necessary.

Applying primer for gypsum board is also a standard process in the construction industry, because applying primer can fill in the fine voids on the surface of the material and help prevent mildew.

Sometimes the surface of the base layer to be treated is very dirty and cannot be cleaned, and it is necessary to apply a primer.

To apply light-colored paint on a dark surface, you can also apply a primer to cover the original color.

How to choose a primer?

There are many types of primers to choose from.

1.
According to the porosity of the base layer

For the loose and porous base layer, it is advisable to choose a penetrating transparent primer coating, which can penetrate deeply into the capillary pores, so as to achieve a good sealing effect.
For the base layer with low porosity, you can choose a film-forming white primer to seal the base layer in the form of a dense paint film.

2.

For the base layer with high strength and high hardness, a white primer with a harder paint film should be selected as the sealing primer to achieve strength matching.

3.

For walls with strong alkalinity and efflorescence, solvent-based primers with excellent sealing performance should be selected.