Powdercoat or for the normal consumer, use Interlux Perfection 2-part. Check out Interlux's website for complete process for cleaning, priming, painting aluminum. I would use a HVLP detail sprayer. You could probably actually get away with a preval sprayer as well.
Instigator 1991 220 Predator - Wilmington, NC
Formerly Evangeline 1987 20' Shamrock Predator - Murrells Inlet, SC
MIM 1977 Boston Whaler 17' Montauk - Murrells Inlet, SC
Rag Time 2004 24' Triton - Murrells Inlet, SC
Formerly Reel Time 1989 26' Shamrock Predator - Sneads Ferry, NC