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Message: <blockquote data-quote="point and laugh" data-source="post: 1750888">I discovered the trick entirely by accident while eating a PB sandwich and working on an old barrel, some PB spilled on it and the magic was discovered. I don't know how it works. It also repairs/hides? minor pitting on old worn blueing. I wipe the PB off then rinse it with Hoppe's #9 solvent. Then oil. It works well on old dark bores too, spray the bore with windex, slather in the PB with a little mop, finish your sandwich and clean it out. Perhaps there is a chemist among us that can explain how it works.</blockquote>