Our home was built in 1902, and we are remodeling one of the bedrooms which seemed simple enough. But we tore down the wallpaper and found not one, but several layers of wallpaper, and a brittle plaster wall underneath. We tore off as many layers as we could, and sanded the walls to try and make them smooth, but to our dismay, the walls just keep peeling. We also found a huge hole in the ceiling, and giant cracks in the wall. The third picture shows after we tried sanding, we primed the wall, but as you can see, it just peels and peels. Does anyone have any suggestions on how to successfully prepare my walls for painting, how to plaster, or maybe has some experience re-doing a century home?