You didnt crack the paint? Maybe because it was OEM paint, the only car I ever done it on had a doo doo paint job on it, which cracked off when I took the bat to the fenders...well come to think of it, it wasnt so much the new paint's fault because the original paint under it cracked off too. My buddy started rolling the ones on his GTO, and cracked the factory paint on it too. Thats enough to make you want to cry.