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Alligatoring Paint Problem

These cracks may not reach the surface of the paint and grow wider and deeper, which can break through top and bottom coats.
Alligatoring:   Definition: Resembling the scale of an alligator, this problem progresses with slight cracking or “checking,” which occurs when paint film cracks on… http://www.protegritypainting.com/blog/painting-problems/2015/01/alligatoring-paint-problem/