I am in the process of salting and sensitizing some expired glossy gelatin silver paper that I fixed and washed. My first try with dry paper curled worse than an autumn leaf and I had so much salt solution on the back I just completely immersed it. Then I had the bright idea of soaking the paper for a few minutes in water and squeegeed the back and floated the paper. That worked quite well, but I am worried about having to sensitize dry paper. I am going to try to damped the back with a clean sponge or washrag to get some humidity back into the paper fibers. (RH in the darkroom is right around 50% and the temp is 68*) Has anyone had success with any of this? My respect for 19th century photographers is growing by the minute.