What is primer? How to choose according to the coating requirements

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The primer can effectively seal the base layer and make the wall base layer stronger.

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Some walls have strong alkalinity.
After being soaked in moisture, water, etc.
, alkali blooms will be produced.
The scientific name is "pan-alkaline".

2 Adhesion

The primer can enhance the adhesion of the topcoat and improve the adhesion between the latex paint film and the wall to prevent the wall from peeling off.

3 Fill up

Primer can make up for small cracks and improve the flatness of the wall.

If your wall is relatively flat, you don't need to use the primer, of course, the effect will be better.

4 Cost saving

The price of the primer is average, and it is cheaper than the top paint, so applying the primer before applying the top paint can save decoration costs.

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The difference between primer and topcoat

1 Different composition

The primer is composed of four parts: resin, filler, solvent and additives; the difference between the top coat component and the primer is mainly that the former has little or no filler added.

2 Play differently

Primer is the first layer of the paint system.

It is used to fill the paint surface, support the top coat, provide fullness, reduce costs, and help save energy; the top coat is the final coating of the painting, which is the last in the building wall decoration The applied layer is to increase the thickness of the paint film by increasing the number of coating layers of the topcoat and thickening the topcoat.
The thickness of the coating is mainly provided by the primer, while the topcoat mainly plays a decorative and protective role.

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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.

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How to choose a primer?

There are many types of primers to choose from.

How to choose a primer should be based on the characteristics of the base layer and topcoat.
Usually, the following aspects are available for reference:

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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.

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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.

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