painting my 71 dart bumpers...

Try some 0000 steel wool, I think that is the finest. I did my bumpers and it removed most of the "aging". It won't take off any pitting but it does come out respectable. Also, won't get rid of dents, dings or cave ins...had to cover my butt. Followed up with a coat of wax and they look respectable. I'm sure that guy flying over my house at 35000 feet thinks their the nicest bumpers ever!!!