Overlaminates 3619 and 3620 are designed for use on digitally-imaged backlit sign faces and are compatible with 3M™ Panagraphics™ III Flexible Substrate, 3M™ Scotchcal ™ Translucent Graphic Films and 3M™ Piezo Inkjet Inks. They provide added durability to flexible, flat, rigid, thermoformed backlit sign faces. They protect digitally imaged graphics from the environment, including ultraviolet light. They are backed by the 3M™ MCS™ warranty