If it still floats don't worry about the honeycomb inside. As long as the integrity of the hulls are sound, the materials on the inside shouldn't matter. If its broken down flotation material then the drawback would be that it would probably sink (or come close to it) if it was holed or broken. If you know this then you can prepare for it i.e. lifejackets, flotation cushions, stay close to shore, etc, etc. Any situation is manageable if you know what you're dealing with. On the other hand if the hulls are very soft and leak then the "hole in the water that you pour money into" theory would definitly come into play here.
<br>Your call, sail safe, have fun.
<br>
<br>Clayton
<br>H20, H16<br><br>