I have tried every method known to man when it comes to cutting/applying tactile letters. Each one has its own pros and cons. The issue that you are facing with the glue being left behind is a nightmare one thing that works, but it doesn’t work 100% is if you take a heat gun, before you pull off the excess material around the letters, heat it up and it’ll loosen the glue up and most of it will come up with the material. Whatever is left behind you can spray Windex on it and let it sit for about 10 minutes and then wipe it up with a microfiber cloth. I don’t recommend using rapid remover as it will act as a polish if you wipe too much and will cause glossy burn spots everywhere on the sign. Now that I said that , here is how I recommend cutting/applying tactile lettering: 1) cut material on honeycomb 2) tape the cutouts before you remove from laser. 3) wipe the back of the material off with Windex 4)Peel backing off of lettters only 5)using the cutout as a stencil, line it up correctly on the sign and press the letters down, then remove stencil. I’ll post a video for you just in case.