After reclaiming the dirt from the mountain road, I started putting grass on the mountain. I mixed up about 3 gallons of green and about 10 quarts of brown, and had shakers with large brown and green foam on hand.
Here' a picture of the green bucket:
The spray bottle has diluted white glue with a few drops of dish soap in it. The dish soap allows the mixture to seep into holes. The spray bottles last about 3-4 hours and then the sprayer breaks. They don't handle the thick mixture well.
The mountain is done by painting the flat area between the mountain and the road, and then spritzing the area above or below with the glue mixture. Then large foam is blown on, then the small dirt, then the whole flat area coated with the green mixture. The flats are tamped down into the paint.
You can paint over areas that were already done. Or spay more glue on and throw foam.
Here's the south side before the excess foam was reclaimed:
That's the whole three gallons of green mixture and about 5 quarts of brown.
After sweeping and vacuuming the excess I had about 1 1/2 gallons of green mixture that had more brown in it than the day before. I'll add more green to the bucket and do the other side. By using large amounts of mix, I can make areas of the layout shift color. Small mixtures result in a checkerboard pattern that is not realistic.
Here's what it looks like after reclamation:
For the slopes where I want exposed rock, I can just brush harder with the broom to reveal more of the rock underneath.
The reclaimed material with more colors added was used on the north face of the mountain. The 3rd sprayer died, and I didn't have another so the area from the cliff face to the post has nothing on the slopes.
Here's the north face before reclaiming excess foam: