Oxpho blue is tops. A very easy way to get a good finish is to spray your clean, polished parts with 409 Cleaner and apply the Oxpho Blue right on top of the cleaner. The cleaner acts as a wetting agent and also cut through any slight traces of oil still on the parts. It is important that you don't wait too long between finish polishing and applying the blue, certainly no more than 2 hours. The problem is oxidation begins to form on the surface of the metal. It is so thin you can't see it, but it is there. Iron loves oxygen. So as soon as you finish polishing, degrease and get on with the bluing and you will get a better finish.
RWO
