What is the best sound deadening product

[Boarder]

View attachment 6684 I've got more detail or will have more detail in my 2014 upgrades post but I just completed my sound deadening project so this is all very fresh.

What: 17 linear feet (1' x 4.5') of 1" thick peel and stick fire and water resistant foam with a reinforced foil / reflective face and a roll of foil tape.
Where: Replaced all hatch material (and added a little back), surrounded the engine compartment from the level of the engine mounts creating a dome like cover over both engines. Also put on the bottom of the fuel tank cover and part of the compartment.
Time: About 20 hours
Cost: Around $400
Tests: via a decibel app on an iPhone 4s with: a) no insulation at all, b) just the hatch and bulb seal (on the water and trailer), c) after the project completed.

I don't know if it is going to work but my usual crew and I thought it worked well on the Yamaha SX230 HO I used to have and the engines in my 242 only rev to 8K instead of 10K, so I am expecting at least similar results.

Here are some fresh pics.

@Bruce , I think we are of the same mind on this. That is, try and isolate the engine sound/noise to somewhere other than the cockpit. I've stated this before but I'll never do this again myself. If I could afford to pay someone that I trust doing it I would.

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wow!!! Thats Sexy! Great install!! What product did you use?

 

[JaPoi]

I installed Acoustiblok (http://www.acoustiblok.com/marine.php) on the engine cover over the winter. I'm planning on doing the fuel tank cover as well. We're taking it out on the water for the first time Memorial Day, but initial on-land results sound good! If all goes well, I'll put this stuff everywhere.

I know it's been years since you posted this. But I just bought the same stuff and have some questions. You still active on this forum? Thanks.

 

[Chewiem16]

I would like to see pictures of the speakers in the seats!

Going through the posts to find some solutions for sound deadening and I saw this rear speakers installation.

Check out my channel and the video I did to show how I installed mine:

 

[Jimmers]

3M has a product 2552, it is a vibration dampening tape and is advertised as a lead foil sound dampening tape. I have tried strips of it on metal carts and it does make them quieter. I have not tried it for the boat but I will this summer, the key of that will be finding out where the vibration is really coming from. Google 3M 2552 dampening foil tech data and see what you think.