Solid Marker Glow-In-The-Dark is the first marker of its kind to incorporate safety-grade photo luminescent material for easy Glow-In-The-Dark applications. It can write on, stay on, and glow on smooth, rough, oily, wet or damp surfaces. Photo luminescent pigments are the basic component of this Glow-In-The-Dark solidified marker. Possible applications include those for: aerospace, commercial fishing boats, fire stations, mining, search & rescue, automotive sales, construction sites, highway construction, shipping, warehouses, and safety and directional signage. 13mm wide mark can be trimmed with knife for smaller marks. Working temperature of 15°F to 248°F (-10°C to 120°C). Easy twist-up paint stick advance and secure cap keeps this paint marker ready to use. Meets ASTM E2072-02 Luminance Standard. Avoid use on acidic surfaces lower than pH of 2.0. Alcohol-based cleaners will remove ink from non-porous surfaces.