Popeye.....I live in the extreme heat to Arizona which is HARD on paint. You say no clear coat is needed with PPG pain you mentioned, my thinking is that the additional clear coat give another layer of deflection or the harmful sun rays. I had a "cheap" repaint of a few of the outside of metal storage doors 2 years ago and it is starting to flake. Granted I suspect the prep was not as good as it should have been (I did not observe it)and the rig sits outside in the direct sunlight. Thoughts? Can you point me to any write up that have been done recently that might be of use TY Joe