What is a common cause of pinholes in a finish?

A common cause of pinholes in a finish is excessive atomizing air on the spray gun or moisture. When the atomizing air pressure is too high, it can break the paint into very fine droplets, which can lead to the formation of pinholes as the paint dries. Additionally, if there is moisture present in the air or the paint, it can create bubbles that surface during the drying process, resulting in pinholes.

Proper application techniques, including controlling the air pressure and ensuring that the paint is free from moisture, are critical for achieving a smooth finish. This is essential knowledge for anyone involved in the painting and refinishing process, as it directly impacts the quality and appearance of the final product.