Loon Outdoors Hard Head Fly Tying Cement::Feel good about what you are bringing to the water with the Hard Head Cement from Loon Outdoors. Non-toxic and odorless, this cement is safe for fish, fisheries and fishermen alike – without compromising quality or performance. Hardens and dries with a glossy finish, Hard Head is a thick head cement perfect for building glossy heads and bodies. DIRECTIONS FOR USE: Remove cap. Use supplied applicator brush to apply Hard Head to flies. Replace cap to prevent Hard Head from drying out.