I have lived in Texas most of my life and can tell you from experience
that my trailers will ALWAYS be white. On bare aluminum, use a solution
of 10/1 water/white vinegar to etch the surface. Rinse thoroughly and
use alodine per lable directions. A good quality, latex gloss
housepaint can be rolled on with a low-stipple mohair roller and the
results look sprayed. This paint, applied properly, will last 15 years.
If you're in a dry climate and have some shade for it... it'll last
much longer than that. No primer, no spray equipment, and a decent
paint job for less than $200.00. Who could ask for anything more?

Jack Womack