In answer to the questions above, the yellow layer is usually the coarsest grained, fastest of all emulsions, and yes, Kodak coats up to 20 or so layers at one time in a single pass. I believe that my max was 14 or so.

You have to remember that this is also at very high speed, probably 3x faster than most of the industry standards, and orders of magnitude faster than many 3rd tier companies.