Yes, the scrim foam from, for example, Martrim, comes with a cloth backing. It's put there to make it better behaved when sewn into panels, pleats etc.
Closed cell foam is available - sometimes in neoprene form - like wetsuits - sometimes for waterproof cushions.
Having asked everyone I know the bias is in favour of using non-closed cell foam. While it may soak up water, it can also release it over time. If water got in between closed cell and metal it would stay there longer.
But a really good paint job will help a lot. I have some Massey-Ferguson charcoal grey left over so that will do well over the primer.........
Then a good dollop of wax into the hollow sections
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