I tried painting on my watercolor paper with my acrylics. For the methods I am using it really didn't work that well. I had a few sheets of yupo so I thought I would try that. The shiny surface actually worked quite well. I am also experimenting with many tools. Some of the cheapest are the best! My favorite is a paper clip. Can you imagine that? I am able to flow the paper clip under the paint and move it oh so subtly. Where that comes in handy is if I have an edge that is too straight I can move it oh so slightly.