Also known as: Boiling, solvent boil, boil, popping,
Description
Blisters on the paint surface caused by trapped solvents in the topcoats or primer-surfacer, a situation which is further aggravated by force drying or uneven heating.
Origin and Potential Causes:
-
Solvent or air trapped in film escapes during drying leaving pop marks.
-
Incorrect spray viscosity, spray pressure, flash off time, or improper drying.
-
Incorrect choice of hardeners and/or thinners. Use of fast-dry thinner or reducer, especially when the material is sprayed too dry or at excessive pressure.
-
Excessive film thickness. Insufficient drying time between coats and too heavy application of the undercoats may trap solvents causing popping of the color coat as they later escape.
-
Incorrect drying of primer / fillers.
-
Improper surface cleaning or preparation.
-
Infrared facilities too close.
-
Baking was started too soon after application.
-
Baking temperature too high.
US | 
