I use the tape just to hold it to my head, then I apply the glue to my head following the curvature of the plastic. Tape is simply to hold it in place. I don't use it for cutting the lace. The tape contour idea is great for cutting the lace. You need the "opposite" of the contour for apply'ing the glue, and the plastic fits your head curvature and is easily traceable/cuttable for assisting in glue application. I'm going to try the tape contour concept when I cut the lace on the next one.