2 pound SPF (spray polyurethane foam) used by commercial applicators in buildings is definitely closed cell foam. Water does not penetrate and it is also considered to be an acceptable vapour barrier.
I inflate a truck tube under the bow of my old v-drive flat. It's keeps the bow up making it easy to clip onto the bow eye, I can have it running in a few hours after that lol. Oh yes, the good ol days
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