I have found with some papers, such as Platine, that I get better results when I brush on the oxalic acid instead of doing a dip and dunk. I figure the soak is affecting the sizing in the paper. I place a sheet of paper on a piece of plexiglass and hold it at a glare angle to see that I am covering the printing area when I brush the acid on. I use a 2% solution but a 1% may be fine, never tested that. I spend a whole evening precoating sheets and the next day I'm ready. I guess you could coat one sheet at a time and force dry but I haven't tried that. I use for Platinum/Palladium printing so that may make a difference. Hope this helps. Good luck