Well, I mentioned it. And since I already posted info on the other thread - to avoid repeating I would say summarily: probably not that popoular since its not designed for high yield businesses. Its a product artists use for sealing acrylic and other mediums, and its origin is in that genre.
My goal as a photographer is to (I hope) provide a more unique and quality product in low volume. I don't want to print other people's work and I certainly don't want to varnish them.
It's not water based, so you have mineral spirits to contend with.
Its a different animal altogether. Golden also sells heavier acrylic glazes - I've experimented and not yet come up with anything I'm happy with - but the theory (unproven) is that you could paint texture into your giclee using their other varnishes on top of the glaze coat. Something I'm still struggling with.