I am new to pastels. I only recently became aware of the use of underpainting in pastel art. Upon what materials can underpainting be done.
I have been using colored pastel paper and white drawing paper as the surface for my work. Do you recommend underpainting on paper? Will it work on this surface? What surfaces and media is do you recommend for underpainting.
Yes, I do recommend underpainting on paper. It will work best if done on plain bright white paper. (No need to underpaint if you're already starting with colored paper.)
If you are using wet media for your underpainting, be sure to chose paper or board that will not buckle or be damaged by the liquid you chose. I have had very good results with water and alcohol wet media underpainting on UArt paper, UArt board, and Multimedia Artboard.
I use watercolor, gouache, and wetted hard pastels for my underpainting. All three work well.
I dislike oil-based solvents, so don't have much experience using those to disolve an initial pastel layer into an underpainting. But many pastelists love the dreamy texture you achieve with the solvents. For me, it isn't worth the mess, clean-up, and smell.
Karen Margulis has an excellent series of posts on underpainting, with discussion of various techniques, purposes, and materials that will go far in answering your questions : http://kemstudios.blogspot.com/search/label/underpaintings
Yes, I also do recommend under painting on paper. However, it has to a surface or paper that can get wet. Apart from this, you also need to consider the color of the paper as it has an impact on the results.