It's an exciting option if it works as promised. One gallon at about $40 CND. will cover approx 30 sq.ft at 1 mil thickness. The product rep suggests at least a 2 millimetre thickness or 80ml. So for a typical 220 build at 8x2x2 with a full glass front you'd need approx 85 or 90 sq. which would put it in the $120 ballpark....if it's easier to work with than epoxy or fiberglass, cheaper, and less hazardous to your health then it should be a prefered material. I'm wondering how glass or acrylic will bond to it with silicone...hopefully waterpressure alone won't be the fix. Guys with cinderblock builds would love this stuff too. Ponders in the U.K have been sealing concrete ponds with a similar product for years and they don't mess around I tell you...