Originally Posted by tcp71
Superglue doesn't bond well to porous materials, like wallpaper and drywall. Contact cement, or, if it doesn't need to be instant, RTV sealant, for humid environments like bathrooms.
You are correct, but there is a good chance the wallpaper adhesive is still on the wall that would act as a sort of....drywall sealant. You could always paint the exposed drywall and then glue it if it tore away cleanly. I'm not sure if RTV is the same as construction silicone adhesive/sealant, I've seen mirror installers with caulking gun tubes of actual RTV instead of the clear silicone you can buy at home improvement stores. Either way it would be much easier to brush a thin layer of contact cement than try to smooth a bead of silicone on a piece of wallpaper that is still attached to the wall.