I'm still having trouble locating decent pond liner. I've been to a few farm supply shops that have rolls of plastic that they say is used for pond liner. But, this stuff is very thing and looks like it would puncture or tear with ease; sort of the same quality as the black plastic garbage bags they sell at Lotus.
What I want is EPDM. I know that EPDM is manufactured in Thailand, and mostly used as a vapor barrier in heavy construction and as a roof underlayment. But, I have no idea where to buy such stuff.
I'd be willing to go with good quality PVC, but I can't find that either.
I'm about to leave for the States and could bring some back, but it would probably put me overweight on the luggage.