Sorry...I have to strongly...REALLY STRONGLY!!...second Dale's point...
Plastic is really just hideous stuff. It bonding to everything in nature including genetic codes of living things. We now can not ever really get rid of what this toxic gick has done to our world, as the conservative estimate it would take well over a billion years to just fully mitigate it...and even then it is believed it will still be part of the geologic and genetic record...
I have not found one product yet that ever lives up to its warranted claims and it seems that every time one fails the company is out of business that manufactured it or claims it was "mis application" by the contractor/DIYer.
Perhaps there is a place for these sheets in "form work" and related modalities...after that...straight to a clay seal
land fill...Even then, it will be with us...