Super Blue™ Liquid Gun Blue is the proven way to touch-up scratches and worn spots or to completely reblue most guns. It will give a non-streaky, even blue-black finish to steel (except stainless). All parts to be blued must be thoroughly cleaned with a metal cleaner such as BIRCHWOOD CASEY Cleaner-Degreaser and any rust must be removed before applying the blue. Product Features • Double strength blueing solution designed for blueing highly polished steel parts. • Super blue extra strength gun b