The Mixing Cup is the perfect vessel for modifying head cements and UV Clear Fly Finish, and all but eliminates clean up. Because cements will not bond to the Mixing Cup, once cured they will pop out. It is unbreakable, suctions to smooth surfaces, will not bond to cements or epoxies and requires no cleaning. Suction the Mixing Cup to your work surface. Mix your perfect combination of cements, thinner, and or fly tying powders. Cure cement and pop out.