Thanks Max.
I glued down the cinders first and them let dry. I used white glue with the static grass and applicator next. Then put down more cinders in the grass and soaked it with water. I applied white glue to the cinders and let it flow in. Once that dried, I rubbed in dry cinders to cut the wet look. This was all an experiment so I think I could have just started with the static grass but not sure.
