Painting rims 101 with Machinegunsquid.....(since this is like the 152 time doing so)
PREP IS KEY.
-Use a degreaser/cleaner. Simple Green works great...Scrub the hell out of the rims.
-Use 400-600grit sandpaper on ever surface you plan on painting. WETsand, do-not dry sand.
-Rinse the rims off again, making sure they are spotless. Wait for them to dry and see if you missed any spots with the sand-paper.
-Mask off anything you DO NOT want painted. and Always mask the whole tire off if your tires are still on.
-Mark where any wheel balance weights are on the tire, and remove them.
-Use a decent primer. Self etching is awesome, but not required. Do 2-3 light coats, until everything is a solid color.
-If for any reason the primer coat is rough, wetsand with 600grit and rinse.
-Do 1 very light "tack" coat of your color. There will be barely any color, its simply to help the next coats adhere better.
-Do another light coat, but try to cover a little more this time (slightly heavier coat)
-Do a medium coat. The rims should be almost a solid color by now.
-Do a 2nd medium 'wet' coat. The rims will be the solid color, and when it dries, it should look like it's wet.
-Do a light "tack" coat of Clear coat
-Do a medium coat.
-Do a medium, wet coat....Wet coat is key here, to get that nice gloss.
Let dry for 12+hours, or until fully cured, and have fun.