Was at the Toronto boat show last night and indeed hmp had insulation on sale, C$75 for 13 sq ft. Thanks for the tip. It may not have quite the mass of the other material i was looking at. (Not good) It is thicker (may be good or bad) and has a layer of foil n the outside. (Probably good). Anyway, It was easy to buy. I expect that in leaky a two sided box like the 33ii 's engine bay, there are more impactful opportunities for noise abatement than the bestest ever insulation. Thanks for the input on this question, see below for a link to a pretty comprehensive write up on the subject. There is also an extremely superficial article in the current issue of " this old boat" if anyone is interested in learning very little. ;-)
http://power.cummins.com/sites/default/files/literature/technicalpapers/PT-7015-NoiseSolutions-en.pdfasdfseeseesee Dave.
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