Do you think the DB-100 played a 'big' role in stopping the seepage?
I've got a similar problem, dam with no core and seepage. Draining and repairing didn't fix it. Bentonite didn't fix it. I thought it was starting to seal off but when the water level went down and came back up...started to leak again this year. Looks like the only way is to completely start over.
I would be really interested to know if the DB-100 worked. If so, I think I might just give it a try. Sounds real interesting.
