We experimented with Dr ColorChip on my friend's black car. I think the real key to the stuff is to put multiple layers and don't rub the solution for at least a half hour, thereby allowing the paint to harden. This method does not rub off the paint you've just applied, but requires a little more effort to remove the excess. Be careful not to slop the paint when applying in the first place.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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