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What evidence is there for this"Brass polishes, in general, contain ammonia, which makes thin brass brittle,"?
Polishing brass is likely a two step process. The first with a caustic, the second with a protector (which may be wax based).Sometimes with welding, I'll clearcoat the brass. You should be able to buy spray paints or brush on clear paints which should be fairly inert once it is dry.To a large extent, a think layer of oxidation can be quite protecting. So, personally I'd be less concerned with what is outside the shell than what is inside.
I think that a clear coat paint would be thicker than what I want, and cause residue build up in the tight tolerance dies of my reloading press. I asked if this would work earlier:http://www.detailedimage.com/Blackfire-M32/Deep-Gloss-Spray-with-Polycharger-P272/?landing_id=29&utm_source=Google-Product-Search-PLA&utm_medium=cpc&gclid=CLjquJa3tLACFalgTAod8nbNwA
The substantial protection is lasting not just a couple of days, but well over a month! [...]Misting water on the surface afterward reveals extremely tight and small beads, which allows moisture to roll off the surface.