Loon(TM) UV Fly Finish - Clear UV-curing resins with multiple functions, all while curing in seconds UV resins allow for infinite work time but cure within seconds when exposed to one of Loon-s UV lights. The result: a perfect application with a durable, clean, and glossy finish. The three different viscosities were developed to perform in three different circumstances: UV Flow is the same viscosity as water and locks in threads as a head cement and provides a super-thin coating to heads, bodies or midges. UV Thin is viscous enough to build heads or wing cases, but thin enough to coat bodies on small, low-profile flies. UV Thick is perfect for building big heads, bodies, and wing cases. FEATURES -UV Blocking application needles -Taper-Tip needle prevents clogs -Build fly heads and bodies -Instantly cures with sunlight or UV light -Brush applicator included -Needle tip included for precision tying -Available in 1/2 oz and 2 oz