Its a phosphate finish its what they use in the gun trade to parkerize weapons or tools and spanners, its also used in the paint trade so you don't have to use a chemical primer. The phosphate process gives the surface a microscopic pourus finish so either oil or paint will soak into the surface, the same applies to using the chemical you are using. Its a simple process just boil up the solution, dip your blasted metal part, wash off, dry with a hot air gun and you are ready to paint, oil etc.
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