When I was working in a body shop about two years ago we were getting our supplies from Wesco Auto Paints in Kirkland Wa. They sell a few different glues than can be applied to the back of the fender to glue it back together. I rebuilt many corvettes that had been through some pretty harsh collisions. The manufacture we were using was:
Duramix
Polymer Engineering Corporation
1630 Fiske Place
Oxnard Ca 93033
1(800)483-2043
They will need to know what material your fender is made of it is usually molded into the inside, it could be a code or also a name.
Good luck let me know if I can help you out in anyother way with getting the material.
Jason
When In Doubt Rammit!!