How many painters apply the second coat with exterior paints before the first coat cures. The directions on the gallon can call for the first coat of flat exterior to dry 4 hours before second coat. It's 100 degrees outside and I don't have time to wait 4 hours to apply the second coat. The first coat appears dry after 1 hour, so is it safe to go ahead and apply the second coat? Humidity is at 50%.
In that kind of heat and hour or two should suffice. However, darker colors are different, especially low coverage colors like red or yellow. The longer you let them cure between coats the better. Applying a second coat before the first has cured sufficiently can cause rewetting of the pigments and ruin the hide of the paint. That results in more coats of paint to get it covered. This isn't usually a big issue in light colors, but the more pigment that is in a color the longer it takes to lock those pigments in.
I try my best to plan my days so that I am not recoating within a couple of hours, even though it is dry to the touch. Of course some days this can't be avoided. I am sure in the temps you mention you will be fine.
However some paints can not be recoated for a certain period of time.
I just recently used industrial urethane alkyd enamel, this can not be recoated for 18 hours even though dry to the touch in 3 or 4 hours.
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