Very nice PRR.
I dry brush paints with colored pencils on those types of items, that way the Krylon clear flat spray wont fade the decking.
Thank you! You are definitely right about the spray on flattening agents affecting the chalks. I have used weathering pencils, and just saw a set of them for about $80 (not cheap!) at our local hobby store. I usually just pick the colors I need out of the rack at the craft store. And I too like dry brushing.