It's been a little while, but I finally installed all of the sound insulation around my generator
compartment. I used the Vinyl/Foam Barrier Composite with self-adhesive backing from Soundown.
All in all, it did a good job reducing the noise
from the generator. My compartment is oddly shaped (doubles as a cupboard / seat in the main salon), so it was nearly impossible to completely cover every inch...which I suspect would have made the sound even better. Even so, we played poker last night while sitting on the generator and wasn't bothered by the noise.
I liked the adhesive
backing...the stuff is impressively sticky. Although far from cheap
, I would use this insulation again. If you are able to completely cover the entire compartment, I believe that you would really be impressed. Hope this helps!