The paper comes in a stack of 20 sheets, glued together on all four sides so they stay in place as you paint. Silly me, thought that it would also prevent warping as I wet the paper. One light wash of color let me know that was not the case. It immediately started to bubble up and the paint began to pool. So, I removed the paper from the pad and placed it into a few inches of cold water in the bathtub. I pushed it under the surface of the water to ensure it was evenly wet. I let it sit for around four minutes. Once I took it out, I laid it flat onto a board and taped all of the edges down and let it dry overnight. It was so worth it - the next morning as I worked there was no bubbling as I worked.