The pastel has been added throughout this piece but is mostly visible on the left side. I turned the stone wall into a stone cliff and added the cliffhanger(a little tree) and the opposing mountain in the bottom right corner to aid composition.
Yes! I had to try it and it worked. I've been pushing Yupo to it's limits with all my experimenting. I scored it with an awl, inked and wiped, re-inked and wiped again. I think eventually the surface does abrade creating a very slight 'tooth'. I was going for a stone wall affect, using the awl and black marker to depict the edges of the stones. At that point I wondered what I hadn't tried yet and soft pastel popped into my head. Hey, why not? I sprayed the surface with the blending solution, then as it was drying I added grey and blue pastel. Somehow when the solution dried completely the pastel was sealed to the surface. It can be removed with alcohol or blending solution just like the ink but it's there to stay otherwise.