I think that Airex is a closed-cell material, but Airex and other core
materials are often kerfed to facilitate bending to the contours of he mold.
These kerfs are often not filled, so they provide paths for water to travel,
sometimes great distances.

"Gordon" wrote in message
...
Someone once told me his airex cored hull tested "wet". What does this
mean? I thought water couldn't go anywhere in airex and if the glass is
properly bonded, it ain't going that route either! I don't get it. And
if there was some water in there, so what?

Gordon