I use a Sunbeam humidifier to help raise rh in darkroom and to humidify the paper after drying the coated paper. Sometimes the rh in my darkroom gets down to about 35% and I can still print with success. I don't pre-humidify the papr before coating but I let the coating rest a few minutes before putting it in the drying chamber for four minutes. Then I hold the paper over the mist, about a foot away from the machine and keep paper moving for 60 seconds. Seems to work for me.