What causes solvent pop?

What causes solvent pop?

• A. Trapped solvent from improper flash time
• B. Over-baking the paint film
• C. Excess hardener in the mix
• D. Poor primer adhesion

Answer: (A)

Solvent pop happens when solvent vapor gets trapped beneath a drying paint film and then pushes out as the layer cures, creating small bubbles or craters on the surface. The most common cause is not allowing enough time for solvents to flash off between coats; when a subsequent layer is applied too soon, the solvent is sealed in and later forms the visible pops as the film hardens. To prevent it, use proper flash times between coats, control shop conditions (temperature, humidity, airflow), and apply coats in suitable thickness so the solvent can escape before the next layer cures. Over-baking can alter film properties but doesn’t typically cause solvent pop; excess hardener changes cure speed and can cause other defects; poor primer adhesion affects bonding, not solvent entrapment.

Solvent pop happens when solvent vapor gets trapped beneath a drying paint film and then pushes out as the layer cures, creating small bubbles or craters on the surface. The most common cause is not allowing enough time for solvents to flash off between coats; when a subsequent layer is applied too soon, the solvent is sealed in and later forms the visible pops as the film hardens. To prevent it, use proper flash times between coats, control shop conditions (temperature, humidity, airflow), and apply coats in suitable thickness so the solvent can escape before the next layer cures. Over-baking can alter film properties but doesn’t typically cause solvent pop; excess hardener changes cure speed and can cause other defects; poor primer adhesion affects bonding, not solvent entrapment.