Well i jus did mine two weeks ago.
The way i did it is i put a deck of cards around the tire not to paint the tire (also index cards work good too).
I washed it squeaky clean.
then i sanded it down with light grit paper. works better when its wet.
then i jus skipped the primer color and went with dupli color high temp black paint.
i put about three coats on each rim.
After that i went and put dupli color clear coat. bout two coats.
It came out looking great, if i spent more time they would look awesome but i did a fast job since it was gonna rain and plus ima get new rims too soon.
But for the moment they look really good.
not a bad for wasting an hour or two on a work day off