I use an Elmer's craft bond gluestick to secure pattern pieces to my glass. Let dry a few minutes. The pattern pieces remain in place through sawing and grinding. The advantage is that you can cut and grind up to the edge of the pattern easily if a thicker paper is used. The pattern pieces remove easily by soaking finished pieces in warm soapy water for a few minutes. This process has really sped up my timeline for making projects. This is a hint I learned from another glass craftsman.