Digital BW, The Print

Can someone explain this process of using rods to apply the coating?
Better yet, show some pictures of the set-up?  I've heard about this
since joining the list, but still have not seen anything that really
gives me a good idea of what the heck it's all about.  The rod
manufacturer's websites don't show anything that I can find.

Thanks,
Ed
http://lightandsilver.com