I always keep a good supply of Splash Zone aboard. I once had a leaking through hull
nipple on my aluminum
boat. I mixed up some splash zone, and wrapped it around the nipple, the cold water
kept coming in, so I split a ziplock bag and wrapped it around the outside of the splash zone and secured it with electrical
tape, which held the splash zone in position until it cured, and no more leak, lasted until the end of the fishing
season, then I sawed it off flush with the hull
and welded a plate doubler over the hole, and that was that.