Latex and acrylic paints are favorites for exterior projects because they are water-based, fast-drying, and low in odor. However, hot weather presents serious problems for these types of paint. When temperatures rise above 90°F, especially in direct sunlight, latex paint can dry too quickly on the surface.
This quick surface drying, also known as “flash drying,” prevents the paint from forming a proper bond underneath. As a result, it can lead to cracking, peeling, or uneven finish. The surface may look fine at first, but the paint job won’t last as long.
Surfaces like wood, vinyl, or aluminum siding can absorb heat throughout the day. On a 90°F day, the surface temperature can easily climb above 120°F. Latex paint isn’t designed to be applied on surfaces that hot.
Following product guidelines and watching the weather forecast are key steps to preventing costly do-overs. When applied at the right time and temperature, latex paint can provide excellent coverage and durability.