Solarez UV Cure Hard Formula. No more mixing 2-part epoxies! No more wasting precious fishing time waiting for messy epoxies to set-up when you are tying your flies. Available in two formulas. THIN-HARD and THICK - HARD. The Thin - Hard Formula is approximately the same viscosity as 30 wt. motor oil. It is easy to apply a thin, shellac-like clear coat that will cure in seconds when irradiated with sunlight or our UV flashlight. This product is a very durable aliphatic urethane which characteristically does not yellow with age. The Thick - Hard Formula is a Hard , very viscous for making thick coatings or spheres - bodies, heads, eyes. Build fly heads and bodies. Viscous formula, easier to work with. Get back on the fish! Work with it as long as you need to as it will only cure when exposed to UV light. It is also great for repairing damaged flies or repairing home projects in a flash! High Power UV Resinator Flashlight sold separately.