This is a good thread on painting
http://www.airforums.com/forum...aluminum+paint
About halfway through is a link to GMC Co-op which is getting into Airstream/Argosy refurbishing. Also a good link to check out.
You can't really polish it because of the caps being galvanized, but there is a paint number that is supposed to match aluminum, or design your own.
I spent a couple of hundred hours (and a lot of cash) removing trim, stripping, painting, and getting it all back together. I figured if I was going to do this I didn't want it to be mistaken for anything else either.
John