| Re: polishing white paint question
Dark Field Micro Inspection:
Since concourse cars are judged solely on the way light reflects from their surfaces this is what really determines the appearance of a car, so you should inspect it under all possible lighting conditions.
For a surface to be optically near ‘perfect’ it should be free of all surface imperfections. The surface should be viewed very closely and from all possible angles. Start by looking at the surface in a darkened room, once your eyes have fully dilated, turn on a bright Halogen light beam. Direct the beam away from you and at a low angle and from various directions (you’ll be able to see even the most minor paint film surface imperfection) this is 100X more sensitive than viewing a vehicles paint film surface in normal light.
This viewing technique is an adaptation of “Dark field microscopy” used in many scientific fields. Direct or cloudy sunlight, shaded, low-angled, directly overhead or light reflected from other surfaces, or the type of artificial light the surface is viewed under can all influence what surface imperfections can or cannot be seen
(See also 3M Sun Gun ®, Brinkmann Inspection Light) | 
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