"Bituthene" is very effective as well. You might try googling Bituthene Mastic. It's hard to find and I'm still on a mission to find it. A buddy had some on sat when I cracked my boat. I emptied the water out of my boat, slapped a piece on the outside and inside and finished my run. It adhears to a wet boat so no need to dry it off. I look at this stuff as a must have for multi day boat repair kit. The only knock I can see is its a bitch to remove if its been on there for any lenght of time.