Krytox™ GPL 255 is for use under black light to uncover surface areas where grease coverage is absent. It is ideal for applications requiring 100% surface coverage or with surface areas intentionally excluded from being covered by grease, such as use on seals, valves, O-rings, and bearings.

Under ultraviolet light, Krytox™ GPL 255 gives off a yellowish-green color visible to the unaided eye. The only equipment necessary is a standard broad-spectrum ultraviolet lamp, commonly known as a black light, that emits long-wave ultraviolet light in the 365 nm range, which is available from most common industrial supply companies.