I don't know about that one but Bend Tarp and Liner sells a liner that looks like black figerglass cloth, is super strong, and can be seamed to any shape with a heat gun. They can make liners to fit. I used one of their liners in my 12,000 gal pond and they came out and did several seams for me. Maybe this would work for you.
http://www.bendtarp.com/