This helps to optimize film adhesion to the substrate making the carrier easier to remove. The best way to remove the carrier is to flick a corner with your finger and then use a piece of tape to pull the sheet off. Pull it off quickly. All films contain acrylate monomers which can be irritating to the skin. This is the same for RapidMask.
Most people never have a problem.
DuPont always uses the least offensive ingredients in their products, but cautions people to be as safe as possible when using their products. With the carrier and slip sheets in place, the film is protected on both sides. RapidMask works differently than other films. When UV light passes through the clear areas of the artwork to expose RapidMask, these areas of your glass or substrate will be etched. The exposed areas of RapidMask are blasted away during sandcarving, while the unexposed areas remain to protect your substrate.