What is a common cause of fish eyes in paint?

Fish eyes in paint are commonly caused by contamination on the surface, such as wax or silicone. When contaminants like these are present, they create a barrier between the paint and the substrate, preventing a proper bond. As the paint is applied, these contaminants cause localized areas where the paint cannot adhere, leading to the formation of small, crater-like defects that resemble fish eyes.

The presence of contaminants disrupts the even flow of the paint and compromises the smooth finish that is desired. This issue highlights the importance of thoroughly cleaning and preparing the surface before painting to eliminate any substances that could lead to problems in the paint application process. Understanding this allows auto body technicians to take preventive measures, ensuring a high-quality finish without imperfections.