I understand everyone's concern about the harm it might have because of fluorine or chlorine, but I not printing in an non ventilated room. I wouldn't printed with glues on painter's tape in a non vented room either and for the fact that i'm melting plastic. Here is a link to safety date sheet on the material I use, for those concern. Oracal 651. http://www.orafol.com/tl_files/conte...ediate-cal.pdf. If you don't think it's safe please don't use it.