please help, my car has a hole in it

[grandprixguy]

my 82 grand prix has a hole in it, whats the best way to fix it? ive bought Bondo, FiberGlass Mat/resin liquid stuff (how do i use that?? no instructions), and some metal Tap.

o ya and heres a pic to show you the hole. The hole is a bit larger now and i can get to the other side of it in the trunk

[BullShifter]

Rust is like cancer, chances are its gonna come back. The best way to fix that would be to replace the rocker panel. Next choice cut out all the rust & weld in a new piece a metal.