All you need do in most cases, is dampen a piece of cotton flannel and give the area a good rubbing. The chemical goes through the oil on the gun, removes thin rust and blues the steel underneath. No after-rust. For looks, the final finish was not intended to approach the beauty of the well-polished, hot-blued gun. In the hands of a careful craftsman, not only is the Oxpho-Blue finish beautiful, but it is also more durable and weather resistant than any other known chemical finish. The Creme version provides the same easy application, tough finish and superb results as our liquid Oxpho-Blue with the added benefits of the creme formula…It won't evaporate away or run off, giving plenty of work time.