If the second coat is applied before the first coat dries, what defect occurs?

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Study for the California C-33 License Exam with comprehensive questions and detailed explanations. Prepare for success with our targeted practice quizzes and enhance your understanding of painting and decorating contractor requirements.

Multiple Choice

If the second coat is applied before the first coat dries, what defect occurs?

Explanation:
When you apply a second coat before the first coat has dried, the two film layers are curing at different rates. The bottom layer is still soft and releasing solvents as it cures, while the top layer begins to dry. This mismatch traps solvents and creates differential shrinkage between the layers. The result is cracking in the top layer that forms an irregular, net-like pattern—resembling alligator skin. This is the defect known as alligatoring. To avoid it, wait for the first coat to dry and cure per the manufacturer's recoat time, and use compatible products and proper film thickness.

When you apply a second coat before the first coat has dried, the two film layers are curing at different rates. The bottom layer is still soft and releasing solvents as it cures, while the top layer begins to dry. This mismatch traps solvents and creates differential shrinkage between the layers. The result is cracking in the top layer that forms an irregular, net-like pattern—resembling alligator skin. This is the defect known as alligatoring. To avoid it, wait for the first coat to dry and cure per the manufacturer's recoat time, and use compatible products and proper film thickness.

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