[csmith12]

Back in my car days, we painted the flexible areas of bumpers all the time. There were a few additives that we put in the paint to allow it to flex without cracking and peeling. On the front bumpers of low stance cars were of particular concern from rocks and other debris, the additives did their job. But was of the utmost importance was a quality paint application w/ 80% of the work done to prep the surface. Next was the upkeep, a little crack or flake in the paint turns into a repaint soon enough.