I took all the foam out of my boat when I replaced the floor and some of the
stringers and did not replace it. If it is against wood you can potentially
trap water and the wood will rot. And don't don't kid your self about
sealing it, water is pretty insiduous over years.

"Sam" wrote in message
...
I am thinking of injecting the expanding foam type product into my
underfloor flotation tank, the boat is a 5m Nesscraft. Has anyone done
this
or even thought about doing it? Would it be a wise move? The boat is
sound,
I just want to add a bit more strength and quiet it down a bit. All ideas
and suggestions greatly appreciated.
Thanks, .. Sam.