Fixing Wallpaper Bubbles

If you have a larger wallpaper bubble, bigger than quarter, cut an X into the bubble and carefully peel back each corner from the center of the X. Then apply some wallpaper paste to each corner and flatten them out with a damp sponge.

For smaller bubbles, cut a slit into the bubble using a sharp utility knife. Then use a syringe to squirt some wall paper adhesive into the slit and smooth out the bubble.