Short answer is it's not recommended. Powder coated and textured surfaces are textured which makes decal adhesion very difficult, especially on decals that have small lettering or details in it. Some customers have applied decals successfully on gun cases and guitar cases and some powder coated surfaces but it is difficult to do so and a good chance it will fail. Smooth flat and slightly curved surfaces are best suited for decals.Short answer is it's not recommended. Powder coated and textured surfaces are textured which makes decal adhesion very difficult, especially on decals that have small lettering or details in it. Some customers have applied decals successfully on gun cases and guitar cases and some powder coated surfaces but it is difficult to do so and a good chance it will fail. Smooth flat and slightly curved surfaces are best suited for decals. Some plastics and rubber may not be suited for decals because of additives in manufacturing process. Avoid applying decals in very hot or humid weather as it can cause various issues with the install.