The top of your wrap or even the "terminator" in the foil at the base of the strip beside the outer jacket is often hard to see and to search out. If you will discover this "terminator," you may nick it with a small cut with a knife and peel https://docs.google.com/forms/d/e/1FAIpQLScnzxOoMLi_mVKDfID5ub3SyrgFipQyMy-aEGgORkc-xSZdNQ/viewform?usp=dialog