"No Public Restrooms, Thank You" Decal By SmartSign | 5" x 8" Front Adhesive DURABLE. Decals are made from clear polyester material and easily resist heat and UV. Decals last up to 5 years outside. INSTALLATION. Decals have adhesive on the front and stick on inside of the glass, facing out. Decals are easy to apply, simply pull back the paper and press the adhesive side to a window or glass door.