Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
There is also a pond type of silicone that is black, and sticks better than other silicones to the EPDM pond liner. It works really well as a sealant if you can sandwich the pond liner between something. Example: Use it sort of like a gasket in a bulkhead.
It would be my choice of 'adhesive' in this situation. It is not really that great, though. The pond liner will need to pretty much hold itself there, and this is just a little added insurance.