View Full Version : Dynamat???

08-25-2004, 06:02 PM
Has anyone here replace the foam under their engine cover with dynamat? My foam is starting to fall off and i'm wondering if replacing it with dynamat would be a good idea.

08-25-2004, 06:06 PM
You stoled MarkP's dancing bananas!!!! That me know if that works.

08-25-2004, 07:20 PM
I have been having the same problem so I asked the local MC dealer what they use. They told me 3M #77 spray adhesive. I did this a couple of weeks ago and it appears to be staying however I've only ran the boat twice due to the crap weather we have been having.

08-25-2004, 10:10 PM
Thanks, i will give that a shot, but will probably dynamat it this winter. I've talked to a local mechanic and he says its much better (sound deadening and heat resistant).

08-25-2004, 11:10 PM
Dynamat will fall off as soon as it gets really hot under the motor box. It doesn't need much heat to fall off, either. If that falls onto the hot motor, it's gonna be a big mess, too. They do have a product for under the hood of a car, but if your foam just started falling off, 10 years is pretty good for just some spray glue. There are also some sound deadening materials that spray or brush on. You would need to sand the inside so it's not glossy and gives the deadener something to hold onto.

Super 77 works great, or you could take the motor box cover to an upholstery shop and have them spray the cement they use for vinyl tops and carpeting. If the foam is shredded, they probably have something to replace it with. They may even have a denser foam made specifically for sound deadening.

08-31-2004, 05:36 PM
My in-laws have a Four Winns 200. The foam was coming off inside there and I used the kit out of Overtons for I/O sound proofing. Bought the bigger kit and had a bit left over. 2 years, still sounds quieter and better than the original.

08-31-2004, 05:39 PM
I'm kind of surprised it stayed in place. I used some on the bottom of a stainless sink and the first time I had hot water in it, the stuff fell off. And I wiped it with solvent before.

What did Alan do for yours- intake manifold, right?

08-31-2004, 06:07 PM
I didn’t even know what this thread was about, “Dynamat” until I looked in. :wavey:

My foam is starting to come off of the top a little too. I was thinking of trying the 3m stuff but was afraid it would melt the foam. Sounds like I can go for it with confidence. Thanks:banana:

08-31-2004, 08:53 PM
It doesn't melt the foam. Just sticks to it. If you happen to have any other kind of contact cement, you can brush it on, too.

08-31-2004, 09:14 PM
Just went down to see what I had on the shelf. No 3M 77 but I do have some contact cement.:( That 3M stuff is to fun to spray to pass up the chance. And it sticks like crazy too.

08-31-2004, 10:45 PM
And the overspray sticks to the hair on forearms, too. Doesn't mean I like using it.

09-01-2004, 09:10 AM
Dude 3M rocks..:headbang: The over spray does stick to everything..:eek:

09-14-2004, 05:24 PM
for about a hundred bucks you can have it sprayed w/ a spray in bedliner

east tx skier
09-14-2004, 05:42 PM
There's an article in the how-to section of the malibu owners board about replacing the foam with that aluminum backed sound proofing. My foam is starting to come loose, and this will be a winter project for me.

09-14-2004, 06:13 PM
I don't know, finally coming loose after 11 years doesn't seem like a reason to replace it to me unless it got shredded. Even then, you can just replace a section and use contact cement to hold the loose areas on. If you do replace all of the foam, remove it carefully so you'll have a pattern to work from.

east tx skier
09-14-2004, 10:31 PM
My thoughts on replacing it were to keep it a little quieter in the cockpit when we were running. It's only coming off in a couple of spots. My initial thought was to just hit it with the 3m 77 and stick it back on, but that other stuff looked kinda nice. Who knows, I may skip it and find something else to mess with, er uh, something else with which to mess.

04-21-2005, 12:06 PM
From: Paul Sonoda ([email protected])
Date: 04/21/05 09:33:33
Subject: RE: MasterCraft Ski Boat
Dear Brian,
Thank you for your interest in Dynamat. We have had some success dealing with the noise you describe. We recommend two products for your situation. First install Dynamat Xtreme. Second, install Hoodliner over Dynamat Xtreme in your engine cover. The results will be great. Below is a list of product you will need. (Based on common size engine covers)

(1) Dynamat Xtreme Trunk Kit

(2) Dynamat Hoodliners

Please let us know if you have any additional questions.

Best regards,

Paul Sonoda

Product Management Director

Dynamic Control of North America, Inc.

http://www.dynamat.com (http://www.dynamat.com/)

513-860-5094 Phone

513-860-5095 Facsimile

-----Original Message-----
From: [mailto:[email protected]]
Sent: Monday, April 18, 2005 5:42 PM
To: [email protected]
Subject: MasterCraft Ski Boat

am looking for a product that will work well inside the engine cover of my MasterCraft Ski boat.
There is an open cell foam material in there now, that is totally trashed, and needs replacing.
The purpose of this foam is to reduce the engine noise inside the boat. at this point, it is horrendous!
The cover is made from fiberglass, and will be subjected to a lot of heat. the exterior is padded vinyl and carpet.

if you are not familiar with this boat, you can think of it as a "doghouse" cover on the older vans and diesel tractors.

So in all, I need material that will bond well with fiberglass, resist heat, and reduce noise as well.

If I have figured correctly, I'm probably looking at 40 to 50 square feet of material.

1991 MasterCraft ProStar190 Ski Boat

Thank You,
Brian Hammon

(not an edorsement)


04-21-2005, 12:25 PM
that stuff gets expensive fast. i bought some to line the inside area under my back bench of my truck to reduce vibration from my subs. i think i spent about 150 . i

04-21-2005, 12:37 PM
that stuff gets expensive fast. i bought some to line the inside area under my back bench of my truck to reduce vibration from my subs. i think i spent about 150 . i

sounds like..................

underground time:headbang:

04-22-2005, 01:17 PM
Here's another product from Overton's



And here's a link to wakesiderides How To article.

east tx skier
04-22-2005, 02:29 PM
That's what I used. Easy to work with. If it gets damaged, you can fix it with foil tape and it's a virtually invisible patch.