Wow...
It does say on their 101 uses "pond liner" ... But after looking at the MSDS sheet for this product I'd say a pond you didn't plan on putting fish in....lol Here's a lil of what the MSDS sheet stated below... It also appeared that a lot is actually unknown... as in effects... So, I'd say DON'T USE this for a tank build and a wood water sealer... There are many other proven safe products out there for that!
Just looking out for ya
"Will cause severe distress in mouth and throat
Inhalation: Vapors can cause respiratory irritation
Skin Contact: May cause blistering on contact
Eye Contact: Can cause blistering and severe pain" ...........lol prolly not to good for fish I'd say...