Almost any coating that's not rock hard will dampen sounds on thin sheet metal, alas not so on glass hulls. Two choices are anchor stern to the wind or redesign the interior of your boat and move your stateroom aft!!! (UGH!!!) Another alternative is Bose noise cancelling headphones. Wave sounds at anchor should be enjoyed...or at least tolerated....because there is not much you can do about them especially when a spray rail concave shape is formed into the forward hull and passes from above the water level to below...Unfortunately fiberglass conducts sound very effectively, compared to say, wood... It's possible that interior hull sound deadening could be added but I'm not sure what would be appropriate in that potentially wet environment...If it were easy, likely some builder would be doing it.. Rob Brueckner Hatteras YF

3 years ago when I was building my own trawler and ran into a Italian distributor of a brand new Spanish product at the METS boatshow in Amsterdam (this is Europe!). The product, Subertre or Subersilent, was a natural grained cork, bounded through water-soluble resins. Despite they had few experiences on boats I decided to use it on aluminum. >From they past website: "SUBERTRES coats, waterproofs and protects. It is recommended for fagade-renovation, asbestos incapsulation, sports centres floors and industrial depots and also for external walls, interred walls, covering, joint and crack sealing and floors . SUBERTRES is a thermal insulating material, an acoustic isolator and it is also sound absorbing , anti-condensate and fire proof." Today I have to say that each point was true and more. That very special insulation is the best thing I ever seen for a metal boat. No vibrations at all, strictly NO condensation at all and an incredible noise dampening. When we are on the top of the bridge or in the aft cabin, you definitely can't say if you are on a sailboat or a powerboat. No noise, no vibration. The bad news came some months later: the product was so good than the company went to bankruptcy. Good engineering, bad commercial. Well, that was a year ago. Now it seems that the license have been sold and a new company is re-starting the production. I called some weeks ago and yes it's possible to buy some again... if you speak Sevilian Spanish. Have a look at their website, poorly translated, but it's coming back from a long way. www.subertres.com If you want to have a look at the result in our own boat, please visit http://www.auroramagnetica.com/pics-gallery/ We sprayed it while the boat was still empty of any accommodation (click on each pics to enlarge them twice). The cork was tinted in light grey and it's sometimes difficult to see the difference with the aluminum. The second coat, which came over the bulkheads, etc. is the natural cork color. Best of all: totaly insensitive to UV. I sprayed some on the top of the cabin: it cut the heat at least by half. I stopped in West Indies while on trials. The aluminum covered with cork was at 95F while a raw aluminum part was past 149f or more under direct sun. Usual disclaimer. Strictly no link in any way with the company but please to share a good discovery. And I am very happy to see them back to business. Pierre