This is Turtle.
There is a new type Bondo that came out about 5 years ago for cars and really anything from rubber to metal that will let the paint grab it because it's eching ability to hold paint. Any Paint and Body shop people can give you the details of this stuff or I will call a friend of mione who does Body work which told me about this stuff and get the details. I will post it this evening. There is just about only 3 kinds and one is the old Bondo , New Bondo with red Epoxie hardener, and the stuff for fiber glass with Epoxie hardener. This new Bondo is the best and will stay there for ever.
TURTLE