Flex Seal Rubberized Tape, 8" x 5', Black. Super Strong, Waterproof, Instantly Stops The Toughest Leaks, Grips On Tight & Bonds Instantly, So Strong It Even Works Under Water, Triple Thick Adhesive Virtually Welds Itself To Most Surfaces, Fix Pools & Spas Without Even Draining Them, Available In Super Wide Sizes To Patch Large Holes.