hey guys i have a question about the front bumper on my nephews 74 mustang II. I am in the process of sanding it down for paint and was wondering what products are out there to fill in the small imperfections in the bumper?? Is there any certain putty i can use? There are a few small chunks missing from the rubber in a few spots that will need filled in before being painted. It seems like its simmiliar material as our front bumper on our 71-73 but a little harder and not quite as flexable. any input would be great! Thanks guys. Kevin