Perma BlueÂź Liquid Gun Blue
A #1 bestseller, PERMA 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.