Gulff Glowman glows as the name suggests. It is a so called ”glow-in-the-dark resin”. Glowman flies have to be “charged” before fishing. You hold it up to a bright light, and then take it to a dark place. In the dark, the fly will glow for 1-10 minutes depending on the “charging time” and the amount of resin. Due to the heavy amount of glowing powder, the resins are slightly greyish. Please notice that GULFF recommends to mix the resin before use.