render spray over loose fine soil

I'm building a retaining wall, (under an old house), with fine loose soil behind, and I want to limit as much as possible any fine soil sediment movement down into the ag drain to go behind the retaining wall. Does anyone know of any easily applied product like a thin render that can be sprayed over the top of the fine (almost dusty) soil to keep it in place? Looks don't matter - it will be out of sight. And there'll be no walking on the fine soil fill behind the retaining wall.

thanks for any help,

garry





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