JANCHUN Crystal Clear Epoxy Resin Kit is 100% safe for use indoors and outdoors. It's easy to self-leveling and fully resistant to yellowing as well as being NON-TOXIC, which will remain clear all the time. Unlike other brands of epoxy resin that will yellow over time, our epoxy contains UV Inhibitors which helps to resist yellowed trays, tumblers, and glassware. Our epoxy is food safe formula, usually used for artistic items used around food. Usually, finish casting after 8-24 HOURS. It is better to warm them up to between 77 and 85 (F) in cold weather. Use them in a well ventilated