I use a lot of Fusion Fiber, available here. When shaped with a rasp-like tool, it adheres pretty well to foam. For surfaces not roughed up, I use drywall tape or latex primer to get better adhesion. It eliminates one step, as the glue is already in it. Just apply ground foam, and spray wet water over it. You can rewet it anytime to add more ground foam, ballast, dirt, etc. You can cover unused material and use it later. if it stiffens up, just add water again. I even used it on cardboard for a vertical rock wall.
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