I read an article recently in Watercolor Artist Magazine about covering failed watercolors on paper with a mix of gesso, matte medium and water. This gives a new, textured surface that allows some of the previous design to show through. Having several discarded paintings on hand, I decided to try it. The effects are very different, paint sits on top and color can be lifted easily. I saved a few elements from the first painting but most of the shapes emerging now are new. This is definitely a learning experience!