Originally Posted by lambofgod121980
Will I need to seal the tank or can I get away with no using sealer.
That depends entirely on the skill of the welder who does it. Sealer would be a good insurance policy, but should not be needed if the welding is sound. Test by filling it with kool-aid or some colored fluid after dusting the weld area with talc. Any leaks should show up clearly. You can also use solder or brazing if you have access to a torch. Be sure to clean the area VERY GOOD before any repairs. Clean metal solders MUCH better.