When I worked in a sign shop, we called it premask. Available at any sign supply shop, or youcould ask a sign shop to sell you a partial roll.Now a question for someone, where can I get my hands on some spray mask?I've tryed some from my local auto supply store, but the stuff didn't dry, I need something that can be sprayed on and then cut with a blade when dry. Where can i get some, and what's it called?