This decal is often applied to the surface of a safe which is often textured.  This video shows you both a typical installation technique and some helpful methods to deal with textured surfaces.  Please watch the video all the way through before starting your decal application. Please note that it is very important that you don’t clean the surface with any ammonia based cleaner such as “Windex” as the ammonia will attack the adhesive on most decals. The tools used to apply this example decal are available on this site