Don't do it. I tried that with the floor of a boat once... That expand-a-foam bulged the floor of the boat up about six inches. I had to cut the floor out, dig out all the foam, and re-fiberglass it. It will bulge your walls like crazy. Also, most of it is open cell, which means that it absorbs water... Another feature not good in boats or Airstreams.
-Red, learning lessons the hard way...
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Somebody ought to clean these windows. There is a tremendous buildup of gook all over them...
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