Lots of idea and discussion here > http://www.google.com/cse?cx=partner...ank&gsc.page=1
If you do off-road, rough riding you're going to have to find a way to cushion the tank from the frame and not rely on over tightening the studs to keep it in place. There have been many suggestions for this posted here. Thick rubber, cushioned double sided tape. automotive window glass mounting tape, silicone adhesive, etc.
The biggest cause of stud/tank failure is over tightening of the stud mounts. This is exacerbated by rough terrain, curb jumping and bike frame abuse.
Glue, epoxy based repairs usually don't last, if they work at all.