Birchwood Casey Perma Blue Paste is the proven way for touching up or completely re-blueing most guns.
The fast-acting liquid gives a non-streaky, uniform blue-black finish. (except stainless steel)
Both Perma Blue® Liquid Gun Blue and Paste Gun Blue provide great blueing to metal that has already been thoroughly cleaned and is free of rust. Perma Blue® Paste Gun Blue is slower to darken than Liquid Gun Blue, but will build up a denser finish. NOTE: PERMA BLUE® Liquid Gun Blue will not blue stainless steel, aluminum or non-ferrous metals.
