What Causes Car Paint to Have Pinholes?

After the domestic car paint from Automotive Paint Company is sprayed, if it is too dry, various pinholes will appear. If it is serious, it will even sag, and the depth can be the bottom. What is the reason for this?
 1. When the car paints the paint from Automotive Coatings Supplier, the paint film is sprayed too thick. Generally, it is three times, but if you spray it four or five times, there is a high possibility of pinholes. This is because the paint and film are dry when the solvent and air are from The bottom layer is too long to the surface of the paint film. When they reach the surface of the paint film, the surface is already dry, so it can only be broken out. At this time, the pores can't be recovered, so one is left. A small hole.
2, there is a small hole when polishing the primer. This is because when the ash is scraped, air is contained in the ash; after the primer is applied, the holes will be revealed and the holes will be formed.
 3. If the dissolving ability of the diluent is too strong, that is, using a diluent that is too fast to dry, it is easy to break through the paint film to form small pinholes, and different types of thinners should be used according to the ambient temperature. For example, in the summer, using a quick-drying thinner, the paint film is particularly prone to problems.
 4, the paint film is sprayed and baked, the temperature can not rise too fast, because the surface of the paint film is heating up too fast, resulting in dry surface. The thinner and air inside the paint film break through the surface of the paint film to form pinholes.

 5, go grab the uniform, not too close to cause too wet, because the air will be put into the paint film together, excess air and thinner will lead to pinholes.