I made a Vaccuum box to make stencils fro my Bombers, but I am having problem finding the right clear plastic. What I used so far. First I had a sheet of plastic from an old binder that worked great.it's about .007", but that was the only sheet i could find. I went to Office Depot and tried their clear binder clear plastic, to thin. I tried .010" stencil material I get to many rinkles, hard to work with. Is there special clear plastic sheets that work better than others???