Well I have been using only Corbin's Film in 2 Blades now and I have never had one crinkle yet and I duel with it but it is the Thick Wall, because ever since I had my 40" 3/4 EL Thin Wall snap off right at the Emitter I swore never again. But then again it is kind of my fault for telling my friend Nate it was unbreakable and he can break anything.