Long-Lasting Ink -- Its highly pigmented formula is scratch-proof, UV-resistant, and weather-resistant. Smooth Flow -- Designed with innovative valve, the ink flows smoothly with no stops, leaks, or bleeding. High gloss effects can be created on most surfaces. Apply to smooth surfaces for a mirror-like effect. Highly opaque and permanent. Wide Application -- For almost any smooth surfaces. Effective on various surfaces like plastic, glass, metal, clay, foam, paper, and more.