The main thing you'll want is chip resistance, obviously. DupliColor is as good as anything else in an aerosol can on that. 2K acrylic urethane refinish paint (what pros use) would last longer but cost a lot more. If you are featheredging a bunch of old chips by sanding, you may want to use a sandable primer-filler of the same brand as your paint... followed by more sanding... to help fill in the chips for a fresh look.