I experimented with the woodless pencils and lacquer thinner (which I just happen to have, I think other similar solvents, such as mineral spirits will also work.) This time the pencil did smear nicely, though I still had trouble removing lines all the way to white. And I once again used a sharpie to get black. I liked these pencils a lot better than the water-soluble pencil. The big draw back is the need to use the oil based, smelly solvent, which also dissolved the pen marks.
Now I am going to have to see if this drawing will stay on the yupo and if I can paint acrylic and watercolor on top of it.
I still like the watercolor pencils best. Here are the drawings from George Jame’s class. And some new water-soluble pastels. I will try them next.