I have painted with casein in the past and find it to have a rich quality whch I find pleasing and am hoping to secure images with fairly good density and depth with one printing. Since I have begun using it, I would like to stick with it until the very end before trying something else. Don't want to change too many variables at once.
I am sizing 140 lb hot and cold press with 2 coats 20% 250 bloom gelatine. It is fairly 'thick' and it subsequently leaves somewhat of a relief from the brush strokes. I have added glyoxal to the final coat on occasion with no difference in the final image. Once dry, the paper is very (very!) stiff and difficult, if not impossible, to uncurl.
I look forward to seeing your work.