Yes, this is a necessity with cutting celluloid with a laser. Any masking tape will do, but you must tape both sides of the material. Also, in my experience, you want the laser moving at as high of a speed as possible, this means that you may actually want the highest power the laser will output, then up the speed as much as you can while still cutting all the way through the material. If you are already going at full machine speed, then you can start to lower the laser power. On the laser I use I go with 100% power and 60% speed. Cutting slower increases the heat build up and does a better job of igniting the material and melting the edges.Not only can't the power of the laser be lowered, another cool trick is to cover the sheet of celluloid with painters tape. I've done it on mother of toilet seat material as well as thin birch ply and the tape helps get a clean cut or image without the scorch marks around the image or inlays.