Used by first response emergency marine rescue operations, Stay Afloat is a non-hazardous, hand-applied, moldable, putty-like material that instantly plugs leaks in boat hulls and marine fittings. For above- or below-the-waterline use, it is a quick and easy way to plug a leaking thru hull or crack in the hull. The one-part formula is applied by hand, directly from the container with no mixing required. Formulation: Moldable polymer. Recommended Usage: Stopping water leaks above and below the waterline. Material Incompatibilities: Not recommended for inflatable boat inflation chamber repair. Removal: Mechanical removal.