Hi,
My efforts have been with off the shelf Liquid Light and now Formazo emulsions from Rockland and Formulary. I coat 4x5 plates by hand. There are some pictures on this site and more in my blog, http://newlightfarmer.blogspot.com/ Some day I'll try to coat a 8x10. From my experience and pouring by hand it will take two full 35mm film canisters or 60ml to cover. I just bought my second pint last night of Light because it is thicker than the other one.
Michael