Luminous paste is used for watches that need to be read at night or at dimmly lit areas. For example, they are often used on divers watches. The paste is painted on the hands of the watch and also on the dial. It illuminates the time, making it easier to see. Watchmakers use luminous paste to refresh and revamp older watches. With time, the luminous element of watches will fade, so it is nice to repaint your watch and get it as bright as new! Luminous paste comes in different colors like yellow, green, white, and orange.