I am removing old wallpaper in my kitchen. I have peeled a layer of wallpaper off & it came of easily, but I can see a faint floral pattern & am thinking this is another layer of wallpaper. When I try to remove this, I am seeing a green wall, but some of the sheet rock is peeling off too. How do I prevent this, and how come I cannot find any seams for this floral wallpaper?