My Tiger gas tank leaks at the sending unit gasket. Removing the tank revealed warped metal under the gasket seal, due to previous owner brazing the seal ring on top of tank. The gasket sealant that was used did not hold up to gas exposure. I have a new sending unit and gasket. Is there a gasket sealant that will fill in minor gaps under the gasket, and hold up to repeated gas exposure? I have ThreeBond 1194 liquid gasket, HondaBond 4 liquid gasket, and Permatex Formagasket 2. Anything better?