Sorry that I did not catch this thread until now. I do in fact use a 5% solution of Kyraray R1100 as my base coating for both gum/dychromate and Pt/Pd/Au prints on glass. I actualy subsitute the R1130 for gum.. I have only made one cyanotype in my life. So I won't talk about that.
Kuraray1130 is what I use in place of gelatin for all of my Silver-halide emulsions. Since glass is the only substrate I ever use, I cannot speak to other things.
I will watch this forum for welcome questions. B&S does carry the R1130,although you may have to speak to Melody or Dana Sullivan directly to get it,as it is not on their list of chemicals..
Bill