I'm trying to figure out multi-layered gum printing, and the problem I'm having is that the second layer doesn't adhere. I may have not had enough dichromate in the sensitizer for my second layer (I mix very small amounts at a time (0.3 grams of potassium dichromate in 3-4ml water), and my scale has an error of +/-0.1 grams), but I wanted to see if there were other possible problems to consider. WHen I printed my second layer it started to develop okay, but then lifted away from all the exposed areas in solid clumps... so it hardened alright (or at least, to some extent), but broke up and didn't adhere. I do a sodium metabisulfite bath to clear dichromate stain; could that be impacting things if I didn't rinse enough? I'm not really sure what to consider here. I hope I don't have to size, but from what I understand sizing is about keeping pigment from adhering too much / staining, so I don't think that's what's going on here.