I was reading some other threads about the polycryo ground sheets, and saw a few people mention that the window treatment film that can be bought at a home improvement store is either similar or the same stuff. So I bought some of the window treatment film. It is just a thin clear plastic that is shrunk onto the window using a blow dryer. Due to the thickness (or rather thinness) of the material I poked and prodded it to see how strong it is. Surprisingly it is pretty tough. The only downside seems to be that if it gets a tear in it the tear will easily propagate (think of tearing a bag of chips open where you get that rip that seems to just keep going with minimal force).
So, for you polycryo users that have tried the window treatment is there any significant difference? Is the polycryo more tear resistant?

