I used this in my restoration:

http://www.uscomposites.com/foam.html

I used the 2lb version.

It's trickier to work with than 'block' foam, but good for filling odd spaces.

I am a new Ensign owner, getting ready to launch.  What is a good type of foam to fill one of the compartments under a bunk?  I'm thinking about getting some foam board from a building materials store and cutting it into strips of varying sizes to fill  the space.  I like the idea of being able to take it out some time and put it back in again.

Am I missing anything here?  Is any closed-cell foam ok?  If it is, any particular brands or types that have worked for people?

Thanks much