What should I do if the wall paint cracks?

Wall coating is an indispensable chemical product in the modern home decoration process. It generally has primer and topcoat. High-quality wall paint can add color to the whole home decoration, but if the wall surface If the quality of the paint is not good or the quality of the construction is too close, the surface of the wall paint will be cracked and deformed. What should the wall paint crack? Xiaobian suggested that you should start from the analysis of the reasons for the cracking deformation!

Causes of cracking and deformation of wall paint:

1. The surface is unclean and contaminated with oil, moisture or dirt.

2, the bottom surface is too smooth, the bottom layer is not polished enough or not polished, such as polyester paint on the bottom layer, because of its high hardness, good gloss, good hand feeling, insufficient grinding, like painting on glass, naturally lead to poor adhesion between layers Stripping

3, the primer is not matched or the matching is poor, such as the use of polyester paint to make the bottom, the grinding is not sufficient; with the nitro base and the nitrocellulose lacquer is not completely dry, the use of relatively strong medium containing paint is not obvious Bite the bottom and even the topcoat crack; in the case of wood machinery or temperature and humidity changes, the outer layer has a different coefficient of expansion and causes cracking.

4, the primer is not dry to apply the topcoat, or the first layer of paint is too thick, without drying and recoating the second layer of paint, so that the two coatings are inconsistent.

5. The bottom layer of the cement is not fully dried and the pH is too high (alkaline is too large).

6. The construction environment is bad, the temperature is too low, the temperature difference is large, the humidity is large, and the paint film is stretched and contracted by cold and heat, causing cracks.

How to avoid cracking and deformation of wall paint:

1. The surface of the substrate should be thoroughly cleaned of oil, moisture or other contaminants.

2. Choose the matching primer and topcoat.

3. After the bottom layer is dry, apply the next paint.

4, the cement bottom should be fully dry, the PH value is controlled below 8, preferably with an alkali-resistant primer.