Hi all! I want to make a stencil of a design that I want to put on tee shirts. I'm new BTW. What is the best, most durable type of material to use for a stencil, so that I can use it over and over? I'm not there yet, (I'm still shopping compressors), but will be there pretty soon. Is it plastic of some sort, and where do I get it? I have a lot of Exacto Knives. Thanks in advance, I appreciate your time.