found a guy last night that used drylok on a sheet of ply to cover the the back glass because it cracked and seeing these tanks im thinking corner round stuff on the corners to help keep stress of seems and just do good amount of coats and maybe ill try both, liquid rubber for the tank and drylok for the sump. I think for a sump it will work good with low water levels and its ment to seal ponds but i quess still there still talking about concrete. so its fish safe not salt tho and its ment for water tanks i think drinking water tanks but maybe more of an outside sealer cuz who cares if it leaks a little outside.
