Never used elastomeric paint before but a quick googling looks like as long as you prepare the surface properly and apply your paint at 50F or higher, you should be OK. Some people say you need to apply 2 coats to get the correct thickness, but I didn't see that on Behr's application notes. Sounds like prepping the surface is very important for this type of paint.

Probably a bad idea to apply when it's humid, like any other paint, too.

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