Bob, my sympathies! Thanks for being a lesson for us all!
Since my down hasn't come yet (seems like a long time...) my measuring experimenting will have to be next weekend. I don't need any kind of accuracy, it would just be nice to know it is in fact slightly different, so people in the future know what they're getting.
On the WR coating, I 2nd the point about this being a wholesale type of setup, they probably just run it under a sprayer. Since it isn't advertised as one of the DryDown or other 'brand' I imagine it isn't too complicated.