Handles like putty, hardens like steel & sands like wood! Marine-Tex is a heavy-duty structural epoxy, used to repair aluminum, fiberglass and wooden boats, reinstall loose or stripped fasteners, permanently bond dissimilar metals without galvanic corrosion, and fill gouges in wood, metal and fiberglass, making repaired areas stronger than before. Mixing stick have a square edge and a radius edge to help sculpt desired shapes to create more bonding surface for repairs