Before you ask the next question about kiss-cutting masking, I find that a power of 15 and speed of 500 cuts through the masking all the way, but leaves a slight line in the material. Power of 5 and speed of 500 leaves no line in the material, but you wind up with more of a perforated line in the masking. Power of 10 and speed of 500 will sometimes leave you no lines and cut all the masking and sometimes leave a spot here and there of the masking uncut.