I used this to engrave on my 40w CO2 laser and it engraved well at 10% power and cut smooth at 35% power. It smelled minimal, except for the smell of cuts, which still wasn't that bad and was quickly removed through the car's exhaust. Considering the cost of each part and equipment, they make a big profit for anyone with a small engraving business. After removing the protective film, the glass became crystal clear. I also prefer 2mm 3mm for engraving because the images look closer to the surface when flipped on the back.