Even if the foam will not absorb water ( and most will, even if just a bit)it
will hold moisture against what ever it touches. As corrosion never sleeps,
neither does rot...minutes into hours into days into....
And Whaler owners have noticed that over time their boats seem to weigh more
and more and...water weighs 8 lbs. per gal...Hmmm...
I'm against using foam, but it's your boat.
Best wishes
Mike

CaptMP wrote:
removed
And Whaler owners have noticed that over time their boats seem to weigh more

I personally have never heard of this. I know there are a couple
folks out in Ca. who have an old Whaler they are experimenting with
that is obviously 'disposable'. :^) They weighed the boat before
the test, cut some holes through the hull and are going to wait a
year and see how much water it actually takes on or if it will sink.
Can't remember exactly where I sawe that thread but hope the end
results will get posted. Could be interesting.

-Jim