Remember too that when it comes to coating papers, there is no "right" amount. You can't say "You need XXml of total liquid." It will vary with the type of paper used, the method you use to apply it (remember that those brushes absorb some of the liquid) and even the humidity in the room. Sad to say, but with ANY of these processes, it is about practice, practice, practice. I'm about to start Pt/Pd printing myself and I figure if I get it right the first time, I am doing something wrong. A lot of this is more about "feel" and "what works for you".