Amazing Goop Marine Epoxy Paste (4oz)
A fast drying, non-shrinking epoxy paste for emergency repairs. It bonds permanently to metal, wood, fiberglass, and other materials. Works great for filling holes and cracks. When dry (this only takes 20 minutes) you can sand, drill, saw and paint it. Doesn't sag so it works well for overhead jobs, and it's waterproof so you can actually apply the stuff underwater.