I'd like to know this too. I'm currently taking off 5 layers of wallpaper in my kitchen. The first layer was put right on top of bare drywall and it's paper thin. The adhesive on the first layer is very gummy, kinda like putting a sticker on a piece of paper. I have dents, scratches and even huge gouges in the drywall from this. If you find out what this stuff is, I sure would be interested.