Advance Coating Practice Test

High DFT can lead to which type of cracking in coatings?

Mud cracking Uniform crack-free film No cracking Spallation from substrate

Correct Answer:

Mud cracking

Explanation:

Drying stresses grow with film thickness. When a coating is applied very thick, the surface dries and contracts first while the inner layers remain solvent-rich and later harden. This mismatch generates tensile stress that the film may not be able to relieve, so cracks form. The result is a network of cracks that looks like dried mud on a surface, which is why high dry film thickness leads to mud cracking. In contrast, reaching a crack-free, uniform film would require enough flow and stress relief during curing; spallation would involve delamination from the substrate, which isn't the same surface crack pattern described here.

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