Painting aluminum is more difficult than painting fiberglass, due to bonding issues. Anyone that paints airplanes can do it, but you probably wouldn't pay what they would want.
I painted my 1959 aluminum skiff, using spray zinc chromate primer from NAPA, paint paint from Tractor Supply. I "pickled" the bare aluminum with 50/50 vinegar & water twice. Dried it, sprayed the zinc chromate, roughed it with a Scotchbrite pad, sprayed my color coat, and used a clear coat over that. Looks great, and is holding up well. Pics in this section under "My Dad's 1959 Rowboat".
I'm an Eighth Day Adventist. On the Eighth Day, God went fishing!