the cavity side of the deck? I was hoping that as the deck is brand new and
shiny a spray-on or paint-on treatment could be applied. Is there a bristle

Try "slip plate"... it's a paint-on or spray-on graphite material that
is used on farm wagons and such to help them stay unloaded. You'll probably
find it at the local farm equipment dealer.
http://www.slipplate.com