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This.Nothing stays under a deck for long. It is basically a blasting cabinet under a deck, whether with sand/dust/dirt or the grass clippings themselves.
Everyone wants to try it for themselves though instead of listening to those with experience.
I put Fluid Film on half my deck (21" mower) and Mo Deck on the other half.
The Mo Deck works much better at making it easy to scrape off clippings, but it doesn't last long at all, so it's totally impractical for anything more than residential use.
The Fluid Film created a thick, sticky layer on the surface, and it was not easier to scrape grass off.
I've never sprayed anything on a deck since. It's a waste of time and money.