[Perfectlap]

I'm going to tackle repainting my calipers. I took a look at them after cleaning the car and nearly all of them have half the clear coat missing. It's bright red in some areas and dull red in others. Should I just paint over them or should I sand, prime, etc? Also how long a job do you estimate this project to take?

also, while the wheels are off I want to paint the wheel well lining which has dulled. I once used this Dupli-color spray paint for trim on an old Volvo but that was for the windshield wiper trim. Anyone tackle this job too?