Think you meant "Blue Wonder". I've used it for a number of years now. Usually I have very good results with it when doing a new barrel. Mixed results when doing a rifle receiver...has to do with hardness/alloy of the metal. Only other product I've used that I'd trust, besides Blue Wonder, is Brownell's Oxpho Blue, which is great for small parts, screws and such and is easier to use than Blue Wonder. But, for covering a large area of metal...have better results with Blue Wonder giving a nice even finish than the Oxpho Blue.