This brushable, clear varnish is the very same stuff that the Flybox team use on their production flies. Rock-HARD varnish is a waterproof acrylic varnish which sets extremely hard and with a crystal clear finish similar to that of a well known branded nail varnish used frequently by fly tiers. We're sure you'll find Flybox Rock-HARD varnish perfect not only for finishing heads but great for creating strong, super looking buzzer and nymph bodies.