As previously suggested, two (2) coats of zinc chromate primer followed by whatever type of paint you want would be the traditional do it yourself proceedure for aluminum... however, while in Harbor Freight the other day, I noticed that they sell powder coat paint in several colors. That got me to thinking....if you know someone that can do powder coating, I would highly suggest that approach since, with the possible exception of epoxy based paints, after it's baked powder coating leaves a better, harder, more durable
coat than any traditional paint.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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