Thanks for the quick response. I too have buried my tracks with foam board to the tops of the ties. So I think I won't be needing a great deal, but more than one 25 lb bag.
On a section of my layout I used blasting grit for ballast and ground cover. I didn't like it as the blasting grit is too shiny, kind of small for O gauge (would look better in the smaller gauges). Also it was magnetic so I had to make sure that the grit was firmly glued down.
I also tried masonry cement but that also is magnetic, want to keep small particles away from those motors.
So I'll go with the chicken grit and if it's too bright a color I will tone it down with dirt and cinders. Also I will add black India ink to my diluted glue .
