That hole was kinda big first off, way to big!
He’s the trick to using jbweld with gas tanks!
You gotta use a tank sealer! That will keep the jbweld separate from the gas!
Took me maybe a solid day to figure it out and it works likes fucking charmed.
I remember watching custom gas tank builder on tv hunt for lil pin holes all day only to mig them more. It’s pointless, just seal the tank end of story (edited)