Loon Hard Head Fly Finish. Ideal for building up large, glossy, hard heads and bodies. Tough, durable polyurethane formula replaces epoxy in most applications. Convenient brush applicator inside cap. Non-flammable & no toxic fumes. No mixing required. Thins best with Loon's water based thinner but you can also thin with a few drops of water or by warming, which will also speed drying.