A part of the coating film floats from the substrate or the primer in the form of small particles to large blocks, and the inside is filled with gas or liquid, which is called blistering.
Causes of car spray paint
- 1) There are remaining hydrophilic substances such as oil stains, sweat, saline-alkali, sanding ash, etc. on the surface of the coated object.
- 2) The water quality used to clean the surface of the coated object is poor and contains impurity ions.
- 3) Long-term use in high temperature and high humidity environment.
- 4) The water resistance, moisture resistance and air permeability of the coating are poor.
- 5) The coating film is not cured and dried sufficiently.
Prevention and control methods of spray painting of automobile sheet metal parts
- 1) The surface of the coated object should be kept clean, and there should be no remaining hydrophilic substances.
- 2) Deionized water should be used for the last cleaning of the surface to be coated.
- 3) Avoid using in high temperature and high humidity environment.
- 4) Use coatings with good water resistance and air permeability.
- 5) The coating film should be dry.
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