I picked up a complete used escalade roof rack off Craigslist a while back for 20.00 I know crazy just TWENTY BUCKS!!! Now I want it painted black went to a couple shops here in Chicago and no one will touch it because it's chrome now my question is how will I prep so that a body will paint it I did a ill research they said start with 60 grit then 120 and finish with 320. Can anyone lend some info thanks.