I use a system that works very well for me. http://www.thelightfarm.com/Map/DryP...latePart4a.htm
I don't have the arm reach to coat the 12x20 inch plates I gave Kirk, but I have had great results as large as 11x14. I'm looking forward to seeing the mammoth plates when Kirk and Don (6'4"!) get them coated. As with all things art, there are enough great ways to accomplish a task everyone can find a method that works best for them. Coating should never be the roadblock to dry plate photography (or paper making).
Ron: Where are you selling your plate blades?