Red Seal Automotive Refinishing Technician Practice Exam

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What might cause 'solvent pop' in a paint finish?

Improper mixing of paint components

Trapped solvent vapor escaping from between paint layers

'Solvent pop' in a paint finish occurs when trapped solvent vapor escapes from between the layers of paint. This situation typically arises when the underlayers of paint dry too quickly or are not sufficiently cured, causing the solvent that is still present underneath to vaporize and create bubbles or imperfections in the top layer. As this solvent tries to escape, it disrupts the smooth finish, leading to noticeable defects in the paint surface.

The phenomenon can occur under various conditions, such as when the application environment is too warm or dry, leading to rapid surface drying, or when the paint is applied too thickly, which can further trap solvents. Proper application techniques, including waiting for adequate flash times between coats and ensuring good ventilation during the drying process, are crucial to prevent solvent pop from occurring.

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Over-application of paint

Using old or expired paint

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