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Old 10-21-2020, 02:11 AM   #2
Comodave
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City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,185
I put Soundown 2 pounds per square foot underlayment in a previous boat. Not sure if you can source that brand down there. It is a mineral loaded vinyl for the sound barrier with some foam for decoupling. Worked well for me but I don’t have actual decibel levels. Good luck.
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