The birches in this ten year old painting were lifted out with a thirsty brush, as were the highlights in the stream and some of the highlights on the stone bridge. Now days, gesso is often used to resurface a painting-gone-bad. Some artists paint several layers of gesso over the old painting, sanding the surface lightly between coats of gesso. Some like the brush strokes showing in the gesso, and some artists like to create textures purposely on the wet gesso, even stamping or embossing items into the damp gesso. It's great that anything goes. Give it a try.
"HOMEWARD BOUND" Transparent Watercolor on Gesso-ed 140#CP Arches 20 x 14" COLLECTED