I'm making small RC aluminum parts mostly as hobby however I sold a few on ebay.
The other day I tried to spray paint my parts with some "multi purpose" paint. The finish was nice but as expected the paint came off as I scratched a bit. Anodizing would be the best option but probably no anodizing shop would bother anodizing 10 pieces. I'll ask around anyways I have no idea how much would it cost.
I wonder if there is a paint out there which doesn't come off too easily. Would some special metal paint last longer?