My engine hatch is fiberglass. It crunched when stepped on. I took it out, and put tape on three sides. I then poured fiberglass resin in and put a whole bunch of weight on top to clamp. Post dry, no more crunch noises.
You might also want to put tape on all finished surfaces.
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2002 Newmar Mountain Aire Limited 4370 w/ Spartan K2 and Cummins 500hp
ASE Master Certified (a long.....time ago...)
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