Epoxy and Fiberglass

[jklett]

Wipe the area down with some acetone, rough it up with 60 or 80 grit sandpaper and use some 30 min. epoxy(devcon 2 ton works great, or better yet use boatbuilding epoxy like west systems or raka). Like slipknot said, there may be some paint that you have to get off first and the acetone will degrease and dewax it so the epoxy will stick. If you just sand it without degreasing it, anything on the surface will just get pushed around and remain there preventing good adhesion.

[nightfighter]

Grind it and glass it. Like materials bond best to like materials, ie. glass to glass, epoxy to epoxy. Won't delaminate if prepped right. Use mat or cloth with the resin to give joint strength. Like building a mini bulkhead.

[Bigcat]

Sounds like the same epoxy the Big Dig used