The flip side of removable sticker adhesives is, unsurprisingly, non-removable. There are various adhesives out there, however, the most common factor is a more permanent bond. The extent of this bond depends on how porous the material it's stuck to is. The difference between removable and non-removable stickers is in the adhesive. Removable stickers and static-cling have pressure-sensitive forces that hold the sticker in place. These forces can be relatively easily broken, whereas non-removable adhesives are much stronger.