I got a 1941 Wizard 3hp outboard. It is a very nice running motor with a very nice low idle and it is also quiet. However, the fuel tank is a 2 piece tank and I've not been sucessful in sealing it. I try to make sure the surfaces are clean and smooth/flat. What are the best "gas-proof" sealents out there and are there any tricks to sealing gas that I may not know about? Thanks for your help!