this may be off topic but need advice , had someone back into the fender on my ford dully at the ramp the other day and cracked it what would be a good expoxey to try , tried a couple of things from pepboys but nothing they have seems to work , any body repair guy's out there that could help with this. I have seen guy 's use fiber glass but that always looks like cr--- and just cracks again in a couple of weeks.