What is the difference between primer and topcoat? What are the differences in composition and construction steps

It is best to apply a layer of primer when decorating the wall, because the primer can improve the adhesion between the wall and the latex paint, and it can also prevent damage to the wall paint film due to moisture.

Primer is required to decorate the walls.
The emulsion content in the primer is higher, and the adhesion is stronger .
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It can improve the bonding force between latex paint film and wall.
Some walls have strong alkalinity.
After being soaked in moisture, water, etc.
, alkali blooms are produced.
The scientific name is "efflorescence.
" This situation causes the formation of crater-like protrusions on the surface of the paint film.
Eventually damage the paint film.

The latex paint primer can play a sealing role and alleviate this situation.
However, if the walls of your house are relatively dry and the floors are higher, it may not be a problem if you don't use it, but it is recommended that you use it.
Filling up: If your wall is not alkaline and relatively flat, you can use no primer, of course it is better to use it.

What is the difference between primer and topcoat?

1.
The composition is different.

In terms of composition, the primer is generally composed of four parts: resin, filler, solvent and additives.

2.
Play different roles.

Primer is the first layer of wall painting.
It is used to fill the paint surface, support the paint surface and increase the fullness.
The use of primer is conducive to saving materials and reducing costs; top paint is the last layer of the paint system.
It plays a role of decoration and protection.

The function of the topcoat: the topcoat mainly has the characteristics of scratch resistance, gloss, feel, transparency, aging resistance, and yellowing resistance.
The quality of the topcoat directly affects the quality of the entire paint film.

The role of primer: the use of primer can effectively seal the base layer, make the base layer of the wall stronger, and can also enhance the adhesion of the topcoat.
In addition, the use of primer can compensate for the micro cracks on the wall, which can effectively Improve the flatness of the wall.

How to paint?

1.
When dealing with the base layer of the wall, the treatment methods of different base layers are slightly different, but the general requirement is that the base layer needs to be leveled and clean before painting.
For the wall of the rough house, leveling and cleaning is required; for the painted wall, the old paint needs to be removed, and the putty needs to be removed if the wall is used for more than 5 years; and for the wall with the original wallpaper, tear off the wallpaper before processing.

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