Well there a number of different types of glow sand available on the market – some that perform and others that do not. Most are using some variation of Strontium Aluminate pigment combined with other proprietary substances that increase overall glow intensity and duration. AGT Ambient Glow Technology has developed a proprietary type of non‐toxic, high performance glow sand which is available in 3 different glow colors: Sky Blue, Aqua Blue, and Safety Yellow. It’s available in two different mesh sizes: Fine (100-­‐150 mesh) and Course (20-­‐ 40 mesh). Glow sand is typically available ‘uncoated’. What ‘uncoated’ means is that it is unprotected and will disassociate or breakdown when mixed with water and cease to perform. This obviously poses a problem for any concrete, cement, stucco or plaster application where water is utilized. In order to circumvent this problem, each grain of AGT Fine glow sand has been treated with a proprietary coating that makes it waterproof and thereby ‘concrete-­‐friendly’. AGT glow in the dark sand can also be used in solvent or water-­‐based epoxies and sealers!