I was a machanical engineering draftsmanas a young first adult job, making very good money-1970's. I used drafting tape, low gum tape..and templates all day. Why i did not think out of the box that a sharp pizza cutter, templates...clear triangles of great variety.including 24 inch in height and low tac (just like blue painter tape) could have been used on my first quilt fall 1980! I could be rich! We all marked our templates for various reasons..just like uses here! I love painter tape on fabric...hint..thete are multiple stickynesses. Check the little dots on the edge of the plastic wrap packaging. I use middle range sticky..low tac but not weekest or strongest. :0)