This may seem like an obvious one, which is probably why I didn't think to post this until I got burned while handling this hot knife. As any costumer or cosplayer knows, stupid things happen and you get hurt. Whether it's a hot glue gun, hammer, hot knife, sander, sewing pins, power tool, or mechanical pencil, you get hurt. Preventing those injuries and minimizing them is important. Always making sure you're working in an area that can't be invaded by pets, that's well ventilated, and tarps and coverings are put down for easy clean up. Making sure that heat guns, hot knives, lighters, matches, and torches are kept away from items that can catch fire. Gloves, respirators, dust masks, and other equipment should be worn. Even though you may wonder "Why do I need to worry about spending this extra money?" at the same time - MDF has formaldehyde. the glass fibers in Fiber Glass can cause respiratory damage. Fumes from resins, Bondo, and other chemicals can cause an assortment of health issues. Taking that extra step to make sure you and those around you are safe and protected from whatever crazy project you've decided to work on.