Had to patch my brothers in his TT, was a PIA to do, but was successful. Assuming you can get to it, here is how I did it.
Empty tank fully. Sand the effected area down to scuff it up. Then wipe area down with rubbing alcohol. Then mix up so JB Weld, they make like 3 types, do not use the fast setting, use the one that takes 24 hours to hardened. Put a generous coat over the crack/leak. Allow couple days to dry. You should be good to go. Good Luck!
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