Dear David,

My task was to put cyanotype image on glass and protect it from elements and damage. First, I thought of using gelatin as a substrate (sand or etch glass if
necessary) and sandwich with another piece of glass. Then I came across your experiment with Kuraray R-1110 and thought it would make my life much easier: coat glass with polymer, bake it, coat with cyanotype emulsion, expose, process, dry, put another coat of polymer, bake it and get a reasonably well protected image on glass.
Kuraray R-1130 is a totally different beast. It is reactivity with inorganic substances that make it water resistant. I'll be very much obliged if you could share
some specifics of you experience.

Best regards,

Victor altphotoproducts@gmail.com