Superior quality, xylene-based ink formula. Writes on most non-porous surfaces. Ultra permanent xylene-based ink formula. More permanent than alcohol based formulas. A superior product for industrial use. Will not fade in sunlight for at least 10 years. Permanent, water-proof & quick drying. Marker of choice for HVAC professionals and sprinkler installation industry. Marks through oil and water.
Use at -50F to 150F (-46C to 66C)