I used some Mylar that came with adhesive applied and the customer returned after one wing shed its top Mylar after he took the bird near redline! That's when I decided the process needed better "tooth"! Without sanding you are asking the adhesive to hold one smooth surface to another smooth surface.. I have had no problem since I started sanding both sides with 200 grit and wiping both sides with Acetone just before application. Also, when replacing the transition tape, be sure to wipe the area with Acetone just before applying the new tape..............remember the bailout at Uvalde after the newly applied transition tape lifted and the pilot thought he was unable to maintain pitch control. The pilot had removed old transition tape, waxed the bird and then re-applied new transition tape over the wax!
JJ