Re: prep info needed before I paint aluminum...
We do alot of painted alum structures at work and have found one of the best products is the Rustoleum metalmax acrylic urethane. Prep using mineral spirits, wipe off well then spray, no primer. Superb adhesion. Paint is semi-gloss but looses some gloss when exposed to UV for extended period of time.<br /><br />Another we have had good succes with is Benjamin Moore industrial coating M22 series of alkyd urethanes. Slower cure and a whole lot smellier but again tremendous adhesion to aluminum. High gloss product. I'm sure there are many more quality products out there. I would locate an industrial paint distributor and go talk with a sales rep.