I tried several different epoxys to fill a crack on a tank and found that most epoxy's will not stand up to the Nitro.
I did have good results with the two part putty epoxy that you nead together even though it looked like a monkey job.
However for the time and money spent trying to repair the tank and still wondering if it will last and did that work I would suggest a new tank.
If nothing else that will eliminate a problem for sure no guessing.
epoxy - $8
time spent two hours
no leak new tank - priceless
\
-----
>
Mugen MRX4X - Picco P9 EVO2