There was a how-to on here a few years back. Had to do with using a heat gun to warm the paint and a baseball bat between the tire and fender to roll it up. This is a big pain in the butt and hard not to start cracking the paint. Give all the local shops in your area a call and ask if they roll rear fenders or know someone who can. There is an actual tool that bolts up to the lug nuts. It has an arm with a roller on it that rolls the fender lip up.