How long does exterior paint need to dry before rain?

We could write a whole article on this question! Clearly, you want to avoid rainy conditions when taking on an exterior painting project. If you’re surprised by rainfall during your project, stop painting immediately; wait until the rain stops and your painting surface is dry. With most high quality paint, your project will be rain-resistant as long as the paint is applied at least 90 minutes before rainfall. Another big concern is humidity. If the humidity is too high, paint can dry improperly. In short, the industry standard is to paint on a surface whose temperature is more than 5 degrees above the dew point—the temperature at which water droplets begin to condense.

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