Setup a 32 gallon brute trash can to store RODI water. We installed a 1” uniseal with pipe and ball valve. Whenever the trash can gets more than half full with water the uniseal starts leaking at the bottom of the seal. We even tried caulking over it, but either the caulk wasn’t thick enough or we didn’t let it dry along enough because it just poked right through. We let the caulk dry for 2 hours which is what it said on the tube. Anyone have any ideas to stop the leak?