[bigeasy1]

I think a two part Urethane like Awlgrip, Imron, and others are your best bet.

I've decided that i'm going to paint my 23 Tsunami,both the hull and deck,with Epifanes two part urethane.

I just sprayed my outdrive with it and was amazed with the shine and the durability of it.
It's chemically about the same as Duponts Imron paint,but is a bit less costly.It works well either sprayed,or rolled and tipped.

I actually sprayed the outdrive with a preval spray jar,and wasn't very fussy with the application,as it's an older drive,and had some pitting,but the finish,although rough where it was pitted,was very good.

I've sprayed a couple aluminum boats in the past with Sunfire two part urethane,made by Sherwin Williams automotive division,and also had excellent results with that product as well.