Answers to pro painters’ most pressing questions by Rick Watson.

Depending on the substrate and weather, you may need to allow at least 48 hours of drying before priming or topcoating. Lower temperatures, high humidity and porous surfaces may need longer to dry out before painting.

If the humidity remains high (such as 90 percent) or it has rained, you may need to wait longer.

Rick Watson, director of Product Information and Technical Services at Sherwin-Williams, answers questions from pro painters in the Ask Your ProPartner™ column in PPC magazine.

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