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<p>[QUOTE=&quot;Info Sponge, post: 782050, member: 20538&quot;]The material the military uses to preserve firearms is &quot;cosmoline&quot;. Superficially, it&#039;s like petroleum jelly: long-chain, nonpolar hydrocarbons. Different melting point.</p><p><br /></p><p>Something can protect steel quite well and potentially be a bad idea for coins. I&#039;d worry about the sulfur in the petroleum, which can react with coinage metals.</p><p><br /></p><p>One issue would be how to remove it from the coin later. </p><p><br /></p><p>Experimenting on low-value coins might be fun and educational, but it could take decades to find out for sure.[/QUOTE]</p><p><br /></p>

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