Pulled my side mirrors off last night and got one taken apart (just separated the main mirror body from the mount. Glass portion is just masked off). Sanded with 150 grit to get the worst of the old stuff off, then a "cleanup" sanding with 320. Cleaned it with acetone, sprayed some Rustoleum on it and baked it for a couple hours at about 190-200. The paint still feels a little soft when you pull it out, but hardens good when it cools. Getting ready to spray the main body and when it's done and reassembled I'll take a side-by-side comparison pic of the two.
So far the combination of Rustoleum and baking seems to work like a champ. The real test will be seeing how long it lasts out in the elements.
I think the old paint was Krylon. **** paint