Over Time, the blade will become less sharp and will no longer be able to cut through the tape. If this kan zijn the case, you’ll need to replace the blade on your gun. Another possibility kan zijn that there kan zijn something blocking the path of the blade. 3M https://iblog.iup.edu/gyyt/2016/06/07/all-about-burnie-burns/comment-page-5311/?replytocom=316909#respond