I've got a hole in the seam where my "V" haul comes together on the bottom of my ALUMINUM boat. I had a welder take a look at it and he said that trying to weld it would melt the seal that runs through the seam and it would only cause other problems. I spoke with a boat repair shop that recommend It try using a epoxy type substance known as Urethane. Anyone ever use the stuff or have any suggestions on what I might be able to do?