Checking is

Checking is
A . an exposed area of the substrate or previous coat material, caused by poor application technique.
B . a fine crack in the surface of a coating that rarely reaches the substrate
C . a very small hole in a coating caused when air or solvent is trapped in porous film and then escapes.
D . surface breaks in the film that often result from grease or oil contamination and revel the substrate.

View Answer

Answer: B