Once I get all the nice foam composite sound proofing on my engine room
bulkheads, what's the best way to mount stuff back on, like fuel
filters, inverter, and so on. If I screw them through the insulation
doesn't the compression reduce its effectiveness, and don't the screws
themselves provide a path for sound transmission? And good techniques
would be appreciated.

Also, has I've heard that the foam in the panels breaks down and sheds.
Is that a real problem?

Thanks, yours, Crane