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<p>[QUOTE=&quot;Curtis, post: 24717171, member: 26430&quot;]I&#039;m also puzzled by how it happens with a barrier between oxygen &amp; coin, but I&#039;ve also had BD develop underneath. (But rarely, couple times in hundreds, maybe thousands.) I guess the barrier is imperfect and there are still microscopic spaces that allow oxygen to enter.</p><p><br /></p><p>Lately I&#039;ve only used it for fragile/crumbly surfaces to shore them up &amp; give more &quot;structure.&quot;</p><p><br /></p><p>As far as I can tell, once applied, it&#039;s still there &gt;10-20 years later (the period when I used it). It looks &quot;matte&quot; after a few years but turns glossy again when rubbed with a cotton swab. Comes off very easily with acetone.</p><p><br /></p><p>NOTE: If poorly applied it can end up as waxy buildup and/or get gross and crackly over time.</p><p><br /></p><p>TOP IMAGE: Old cracked excessive wax on a silver Corinth Stater. BOTTOM: After removal, maybe a thin layer remaining, much more attractive (especially Athena).</p><p>[ATTACH=full]1580596[/ATTACH][/QUOTE]</p><p><br /></p>

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