Our MagnaStickers are meant to work on most wall types although some walls such as super textured walls may not hold the maximum size of art because the surface area the stickers adhere to isn't as much.  If you are having trouble we suggest you try the following stepsCheck the surface for any excess dust and clean the area with a damp washcloth and allow it to dry.Make sure you RUB THE WHITE AREA of the MagnaSticker very well, remember the metal disc inside does NOT have adhesive on it.Check that your artwork is not curling up, this can pull the stickers off the wall.  See our other FAQ for flatting a poster or artwork.Check that your artwork is not too large or too thick of material. GoodHangups are designed to hang artwork up to 24”x36” but the maximum size varies depending on how thick the paper is. You can test whether they work by trying to hang up a single piece of printer paper.  Note if you have a texture or unusual surface, the maximum size of artwork may vary.If you try all these solutions, please contact us and we will make sure we solve any problem you are having.