I remember setup day in Sarasota F18's a couple of years ago. It was about 98 degrees, the humidity was through the roof, and there was hardly a stitch of breeze. It was impossible to touch any of the black aluminum bits on the boat with bare skin.

IMHO, to have half a chance for anything to adhere properly to the aluminum, look at the aircraft painting industry. Dupont Imron is pretty much their standard but it's EXPENSIVE and nasty from a health and well being standpoint. It's about the only thing that has half a chance to withstand what's asked of it on an anodized sailboat part.