I print on plastic quite a bit. Decades of Cibachrome work, with hundreds of them still looking like they mere made yesterday, and now Fujiflex. Those are on extremely stable polyester, just like high-quality sheet film base but thicker. But RC is on paper with a thin semi-permeable outer plastic sandwich. I do all my b&w work on fiber-based paper. I'm not trying to imply anything negative about RC b&w except that it's not suitable for drymounting; but RC will probably never lose it's reputation with collectors or archivists as an unwanted step-child. They too prefer a track record versus so many projected "hundreds of years" of some marketing BS coefficient.
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