Tailgunner wrote:
Anybody use this in a marine environment? How does it hold up? I'm using
it for a leaning post seat covered in vinyl.

Ethafoam is not closed-cell and depending on the density you use, it can
absorb quite a bit of water. The lower the density, the more this is an
issue. The 2# and to some degree the 4# density are not well suited to a
wet environment. The heavier 6# and 9# densities don't absorb as much.
The difference is due to the smaller pores on the denser foams.