Mounting is the process of stretching and reinforcing artwork done on rice paper with a stronger paper backing. It involves getting the entire painting wet with paste and backing it to another paper to create a finished masterpiece.
This process is often a source of confusion to the artist. Clear instructions can be found in Ning Yeh's, "Chinese Brush Painting: an Instructional Guide" in Chapter 20 or Lesson 20 in his "Emmy Series" DVD collection.