Here's the page on Photrio where Oren Grad posted (#27) the MSDS for a 2014 version compared to the MSDS for the 2019 version. I'm no chemist and don't know if this will be any help in deciding whether the new one is water-based or glycol-based. I don't see water listed in the ingredients. Bill Troop certainly knows what he's doing, and he wasn't able to draw any conclusions about the longevity of the new stuff.
https://www.photrio.com/forum/thread....169322/page-2
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