Gulff Flexman (medium viscosity) is the best option if you need Classic medium viscosity resin features but a flexible and soft finishing. It is very strong, flexible and soft. Remember that predators have large and strong teeth. Thus, Flexman is not too soft. Flexman finishing meets the requirements for shrimps, streamers, fly heads and eggs easily. Please notice that the more flexible the resin is, the more time it needs for curing. Gulff Thinman (low viscosity) is thin but not too thin viscosity for beautiful finishing. It does not cover or fill the fly detail, but highlights it. Gulff Classic (medium viscosity) is the best option for small fly body building and general nymph bonding. Recommend for larvae, pupas, nymphs, scuds and small detail bonding. Gulff Fatman (thick viscosity) is the best option for large fly bodies. It is also thick enough for shaping. Recommended for streamers, fly heads and large shrimps. Gulff Glowman 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.