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Don't forget to clean them with some type of degreaser/thinner after you sand them down...oh yeah, adhesion promotor will help the paint stick to the rim.
heres a pic of my old wheels, i would leave the outer edge silver. also i just cleaned mine scuffed them with a red scotch brite pad and recleaned then painted.
I would sell them and buy a cheap pair of rims to paint. All all-black rims look the same, so at least you might be able to get some decent cash for those.