sand the wheels down, entirely, shoot a coat of primer, sand it, primer, sand it, black paint, sand it, black paint, lighter grit, paint it, even ligher grit, paint, even lighter grit, paint, super light grit, paint, super duper fine grit very very smooth and then you can put on clear if you want, a couple coats.
should come out a nice shiny black that way. just be sure to take your time
