Build perfectly smooth and symmetrical baitfish heads! 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.Features: Non-toxic and environmentally friendly! New UV Blocking application needles New 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