Masking tape is a pressure-sensitive tape designed to adhere to a surface to protect it when painting. The type of adhesive used on masking tape is formulated to make it easy to remove without leaving a residue behind. Using masking tape on a painted wall to hang posters is generally not recommended, as it can remove paint when you peel it off. Scotch tape may be a better option for hanging posters, as it is less likely to damage the paint when removed.