Those decals can be adhered directly to smooth clean walls or window glass with the dust removed; to improve adhesion, you can spray some water where you'd like to adhere the decal to.
Those St. Patrick's Day decals are reusable, you just need to gently peel them off after use and keep them flat for safekeeping, then you can use it again at the next party. And if you paste it in the wrong place, you can carefully peel it off and re-paste it where you want it to be. Because it's electrostatic adherence, it's easy to remove.
Application: Those decals are suitable for window and wall decorations in home, bookstore, supermarket and other places to create a charming Christmas wonderland and party atmosphere. Just make sure the wall or window glass are clean and smooth, those decals can be adhered to anywhere you’d like them to be. You can match them freely following your creative ideas to make your own style of decoration.