[lineslinger]

Dean,
Over 12 years ago one of the 4'x6'x5' steel box blinds in our duck lake started leaking at the bottom of a welded corner seam. These blinds have been buried partially for over 25 years. When we turn on the pumps to fill the lake in the fall only a few inches of freeboard remain.
We mixed up some JB Weld, and spread/shoved directly into the wet leaking crack. We really packed the stuff in there. This wasn't just a trickle, there was a nice little straight stream shooting out of there.
It stopped the leak completely and not a drop has come through there in all the years since then. Not intending to sound like a commercial endorsement but I am a big fan of the stuff, especially when the needs are immediate and appearances are secondary.