Yes, they’re strong enough to hold a 50lb painting.But removing them may well take layer(s) of paint along with! Here you see a bubble that has lifted from the wall, as well as a break in the paint that was torn off by the adhesive picture hanger.Several layers of paint have been pulled away from the wall. This is called ” delaminating .”One reason for this is because the original underlying surface may have been dusty – as in dust from construction, or from sanding new drywall joint compound. Nothing sticks to dust. Other reasons for delaminating walls are incompatible surfaces, such as, an older home that starts out with oil-based paint, then someone comes along and applies latex paint over it without proper prep, then someone adds a gloss paint, then a ” flipper ” buys the house and slaps on a coat of paint without deglossing, ,,, on and on, situations that can cause layers of paint to not stick to each other. End result is that the wallpaper may come away from the wall, too.
The Wallpaper Lady's Blog 