I bought some fiberglass fenders that the previous owner had sprayed with bed liner, such as linex. I'm not sure which brand it is, but it's real tough and I haven't noticed any stars in the paint so far.
good luck.
brian
"So many trucks, so little time!"
Vehicle list: down to 2 now. 1 - 1967 Chevy 3/4 ton LWB 4x4 2 - do I dare say it??? a 61 Ford Unibody