Scratch X... oh yea, that's a real great product...
It basically takes a layer of the paint off your car, as it seems to kind of rub it down a little to match the surface & smoothen it out.
I've used Scratch X (a tanish gel) on a black car, green car, and a silver car... each time on a white T-Shirt that I used to rub it in & rub it off... the rub-off on the T-shirt rag the same color as the car.
Coincidence? I think not! professional buffer is really the best way to go (otherwise, use that color-match wax, which helps a little & acts as a wax along with a color matcher & doesn't take off paint).