[DrBob]

Personally I'd use 400 grit and sand by hand, as the orbital sander will leave swirl marks. The best thing to do is have the chrome lightly sandblasted. Make sure you use an etching primer, like one with zinc phosphate. I'd also skip the clear coat. The clear coat will flake off when the black paint under it flakes off. If you skip the clear you can just touch up the black anytime you want.