Is it leaking? Of not yet, then keep it running.
BTW do you know what is the cost of new fuel tank ?
I guess it would be far better solution to replace it with new fuel tank instead of repairing the old one. Because there is extreme kind of Bud Dua to these fuel tanks of bikes in PK. Once they start leaking, they never stop. You apply magic, you apply super adhesive, or you do a Kala Jadoo on it. But leaks will never stop. So better to replace it.