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My brother is a bodyman and they have to use Rock guard on the cars in the shop. it goes under the paint and is really hard. leaves a texture. but him and I talked about it and yes you could sand it smooth. just repaint it and use that rock shield. that stuff is cool they use that on lots of high end cars right behind the tires.
I have to... I priced some from carquest and should be buying it when am ready... Sorry to those who don't like the idea (which seems to be everyone) but it needs to be done.