Mine had chrome that was hazy , but intact. I just basically solvent wiped them and then shot them with epoxy primer. No sanding or scuffing at all.
After that I shot them with 2K urethane primer surfacer, and then with the single stage urethane. They look great and the paint is still on after 2 full seasons of racing (over 2 1/2 years later)!
Bob
PS: I would recommend scuffing the surface, but had results without this step.