7 mil translucent blue Mylar in Other Materials Posted October 4, 2017 On 3/10/2017 at 6:05 PM, becanie77 said: Hi, did you ever find where to buy the blue Mylar? I'm looking myself, and can't find it, either. Thanks! No I haven't. I have learned it is for laser cutters and the stuff I have found does not have any backing.