I just did a quick test on my new Z3100 to see about this...
-- printed on HP Instant Dry Satin. I think this qualifies as a "barrier paper" where outgassing could apply.
-- made two prints (1) Gloss Enhancer turned Off, (2) Gloss Enhancer used Whole Page (everywhere)
-- put both prints into its own ClearBag, and sealed them up completely to be airtight. Unfortunately, I only had 13x19" bags and I didn't feel like making 13x19" prints, so the prints were much smaller than the bags.
-- taped both bags with the prints inside on my window-testing window, ink side toward the sun (have heard reports of photogs getting fogging in these conditions). Let sit the whole day and now into the next morning.
-- RESULTS: no fogging in each bag.
-- PRELIM. CONCLUSION: (A) these prints don't fog via outgassing, ( my test is inadequate to determine if prints fog via outgassing.
I'll keep the bags up for a few more days to see.
FYI: the Z3100 doesn't not lay a coating over the inks; the GE is blended in WITH the other inks. Same is true of the Epson with Gloss Optimizer... it's not an overcoat. That you would have to put on yourself (currently).
author, "Mastering Digital Printing, Second Edition"
author, "Digital Printing Start-Up Guide"
DP&I.com ( http://www.dpandi.com
digital printing and imaging consultant