Get the lighting right so you can see the defects, and then get the correction right. I *like* white, at least on certain vehicles, when it's really polished up nice.
Know how I'm always bashing fluorescent lights? Sometimes they work surprisingly well for spotting defects on white...no idea why :nixweiss Otherwise, same ol' same ol'...in the absence of a SunGun, try incandescent lighting for inspection, with all the other lights turned off.