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Old 11-13-2013
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Re: Best way to soundproof engine compartment?

3M makes two "strengths" of foam spray adhesive, the stronger (90?) holds up the heavy 1.5" foam with the barrier in it for about a year and a half on the overhead sections (much longer on the vertical areas). This is in a powerboat that sees a lot of rough water. We bought our sound proofing stuff from Hamilton Marine here in WA, very similar to the stuff that Mitiempo sells in BC.
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