CHARGER 727 thanks for that link, it explains their process of "prepaint" to me and seems unlike several people here it does not have anything with being cheap or cutting corners.

Seems that when it is a metallic, it gets BC CC, solid colors are SS. prepaint is painting the car in pieces then assemble, address any flaws and let the paint and primers shrink down, settle in., then a final block and paint the entire car to get the metallics to lay even and consistant.

Don't seem cheaper to me sounds like they use more paint. I would guess he uses a panel blender prior to the final color to bite into the clear sanded prepaint