Makes permanent and emergency repairs on aluminum boats, outdrives, fuel and water tanks and other aluminum parts. Easy to use; just hand knead for 1 minute and apply to damaged area. Product cures under water. Once cured you can drill and tap for screw threads. No boat should be without as this can be the product that saves you from sinking. You never know when a thru hull fitting gets knocked off or a manifold blows, this epoxy stick can save the day and maybe the whole trip.