Regular Rustoleum enamel thinned with Acetone sprays just like the $400/gal PPG Delfleet ESSS I am painting a set of Clamar floats with if the humidity drops some the next couple days.
Several years ago I painted an old aluminum camp trailer with Rustoleum just like that. It worked fine. The only problem is that when you buy Rustoleum in quarts, the color selection is very limited, nothing like what you get in spray cans.
