What is that gray foam that they spray under the motorhomes to cover stuff and fill gaps? The only thing I know of locally is one of the many varieties of Great Stuff. I had to do some work under my Solera and want to replace the foam that I had to cut away.
Never mind. I found an earlier thread that speaks to this.
I've used cans of "landscaping" foam before. It's not grey, it's black. It's sold for gluing stones together and filling gaps in water fountains and things like that. It expands just like great stuff but its black/dark grey. Landscape Black Foam Outdoor Adhesive | Touch 'n Foam
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