Ambient Glow Technology's new flexible Glow-Crete is a glow-in-the-dark, thin-set overlay. Spray, trowel, broom or squeegee the product, with no water needed to apply. Manufacturer testing shows the product will glow for 12+ hours for 20+ years. The waterproof, skid-proof and non-toxic material is available in Aqua Blue and Sky Blue in 1- and 3.5-gal. pails.