Dunno, but…

[rgilbert]

Linda Steider sells a seaweed-based binder on her site http://www.steiderstudios.com/glass-tools-supplies.html that might come out to be less expensive than gum arabic. I don’t know if that’s going to do the trick, but you can email her. I bought a sheet of kelp that is used as an adhesive in papermaking and haven’t quite gotten to experiment with it myself.

Roxane