I got my hands on some sound damping that Submarines use and put it in my neighbors engine hatch cover. It did a pretty good job but not as good as the spray in foam like our original stuff.
There are some pretty good spray in foam you can get off the internet.
I'll look tonite and see what I can find, I use to work with this stuff.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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