I've been trying to source Mylar for drawing on, seems that it's called drafting film over here. Got an A4 sample through - matte on both sides so here's a wee choppy sketch I made to try it out, of my favourite cabinet secretary. It's conte & charcoal, I like the surface you can make some nice textures & marks. I have had some film arrive that is matte one side only so will see how that goes and report back :)
Kenny sketch, photo via the phone as it is still on the easel.