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Advance Coating Practice Test

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What is the term for surface breaks in a coating that reveal the substrate, often caused by grease or oil contamination?
Correct Answer:
Cissing
Explanation:
This defect comes from poor wetting caused by surface contamination. When a surface has grease or oil, the coating can’t spread evenly and coalesce in those spots, leaving tiny gaps that expose the substrate. That specific issue is called cissing. It’s different from wrinkling (where the film buckles as it dries), blistering (gas pockets under the film that lift it), or peeling (the coating detaches from the substrate). To avoid cissing, ensure thorough degreasing and cleaning of the surface before coating, and use a compatible system and proper surface preparation steps so the film can form a continuous, intact coating.

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