RAIDZAP MEDIUM – build heads and bodies. A clear UV resin and quick cure with RZ 365 Pro. Raidzap Medium we know on the flytying table as a normal viscosity, it is neither too thin nor too thick. It can handle most tasks on almost all flies.The most popular formula for building heads or bodies. That´s why, Raidzap Medium is also our most recognized UV resin and our best-selling UV resin for fly tying.