"William R. Watt" writes:

the voids are where the rot begins. heat and moisture in those tiny air
spaces.

Since all exposed surfaces are sealed with epoxy before the glass was
applied, chances of rot are slim and none.

MDO plywood means "meduim density overlay". I read that it refers to a
plastic
coating. It was developed for highway signs, those big ones you see on the
freeways, to be weather resistant. The main advantage is the nice smooth
surface for interior walls, er, bulkheads.

Actually it's a paper covering available on either one side or both sides,
otherwise it standard exterior grade ply.

Nice stuff for making wood working jigs, but IMHO, a total waste on a boat.

Lew