I am making a new 3/4 UQ and I am using sil as a top layer. I got grey sil from Speer. I have worked with sil before and always was able to either hide or erase the markings made by sharpie with some denatured. I did a spot check with the grey which is translucent. It removed a lot of the marker but not all. Now I wish I had ordered black but that decision has already been made. So does anyone have any ideas on how I can mark where the baffles will go? I usually use tape for the baffles, but that won't stick. The only other idea I had was to iron creases in it. Any insight will be rewarded with a big thank you.