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Fumed Silica should work. It is used to gel paints and resins. I think the trade name is Cabosil?

This only costs pennies Try scraping the rust spots with the edge of a copper coin. Be sure to use a coin that is real copper, not copper-washed steel (check with magnet). The coin should be hard enough to remove the rust, but not the remaining bluing. Finally, apply Hoppe's or similar, to...