Sassy Thundercloud Saying Decal This decal is available in permanent adhesive. Permanent Adhesive: - Not recommended for use on Walls Permanent decals are waterproof and will withstand exposure to the elements with great resilience. I have placed multiple decals on my car window. I replace the decals a lot, but only because I like changing them. These decals have great holding power against the elements. Decals may be used on indoor applications, upon removal, However, it is likely an adhesive residue will be left behind. Decals can be used on tumblers, cups, glasses & hydro flasks (hand washing only). Permanent decals are ideal for cars & trucks. These decals are printed, cut & weeded by myself. Made to order