Hard as Hull Head Cement features acrylic polymers and binding resins to create an incredibly hard, durable finish. It also provides a smooth, glossy finish well suited for presentation type flies. Hard as Hull Head Cement is simple to use. A single coat will soak right into your threads or fly material and make a solid, secure connection. Use multiple coats to quickly build up a larger head. This cement is quick drying and the cap includes a built-in brush.