On Sun, 22 Feb 2009 18:02:07 +0000 (UTC), "SteveBell"
wrote:

On Sat, 21 Feb 2009 17:25:51 -0500, wrote:

Yes, the paint was dried in the hot sun. That might be the problem.
Why would this cause problems? It seems that it should dry faster
and harder in the sun and give a better finish.

Paint doesn't really dry--it cures. Chemicals in the paint combine with
oxygen (and maybe other gases) from the atmosphere, changing from one
chemical to another.

If you dry it in a hot location, the surface skims over, blocking
oxygen from the part below. You need a slow, even cure so it all gets
done at about the same time. I'm sure you've seen a mud puddle that
dried in the sun. You get the same alligatoring.

Steve is right, and this applies to painting house exteriors as well.