Hello all! I need help finding a suitable sheet of plastic for a particular type of stencil. It needs to be plastic so that the stencil is water proof, but I also need it to be rigid or semi-rigid so it will stay still and not bend (much) while being used, it needs to be at least 1/8 of an inch thick, though not more than 1/4 of an inch thick, and I need to be able to cut it easily. I tried the sheet plastic meant for stenciling borders on walls, but that was too thin, bent too much while being used, and didn't produce a very good result. Plexi glass is far too thick and can't be cut easily.
Any suggestions?