On Sun, 15 Mar 2009 10:30:23 -0400, HPEER wrote:

Back to the foam. I have a steel boat and the aft half of my keel is
hollow and too deep for me to reach into. I can't reach about the last
foot. The top of the keel extends up so that the sole rests on it and
the hull is welded to the keel all around. My fear was that somehow I
would hole the keel and not be able to control the leak. I had thought
of pouring foam in but don't want to loose the storage space.

I think there's another issue with a steel boat. The foam will quite
likely trap moisture against the hull and promote rusting, invisible
rust at that. I wouldn't do it.