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PostPosted: Mon Jul 17, 2017 1:58 pm 
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Joined: Sat Sep 28, 2013 8:49 pm
Posts: 33
Location: Albuquerque, NM
The old foam crumbled and turned to powder and was falling off in places. I replaced it with 1/2" self-stick foam and aerosol high temp/high tack adhesive. I was able to cut all new pieces from a single sheet of 48" x 54" foam by splicing the longer pieces in the middle. It's supposed to be oil resistant/non-flammable. The surface has a slightly porous waffle texture, which I guess enhances sound absorption. I will find out later this when we go back to the lake. Time will tell if it stays adhered long-term. I really don't care if it doesn't suppress the noise but I do want it to stay put and not deteriorate.

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PostPosted: Mon Jul 17, 2017 8:15 pm 
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Livin' the Dream
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Location: Pontoon Beach IL
Looks great!

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PostPosted: Wed Jul 19, 2017 10:22 am 
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Can you give me more information on the foam you used (name/type/where you got it)? I need to do the same exact project on my cover.


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PostPosted: Wed Jul 19, 2017 3:02 pm 
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Location: Albuquerque, NM
tymorrissette wrote:
Can you give me more information on the foam you used (name/type/where you got it)? I need to do the same exact project on my cover.


I bought it on ebay, listing number: 301817328496

http://www.ebay.com/itm/1-2-Acoustic-SoundProofing-Deadening-Foam-54-x-4-18-sq-ft-Adhesive-backing-/301817328496?hash=item4645b6f370:g:iOgAAOSwAoRXFvIR

It is made by Soundcoat, the seller has a link to the product info on his listing but it is sufficiently vague. I tried burning a small sample on a flame and it is fire resistant. It melts slightly and smokes but does not burn. The surface is slightly porous. I searched for flame retardant spray but all I could find was on-line and somewhat pricey. You can concoct your own mixture by dissolving 3 parts laundry borax powder and 1 part boric acid powder in hot water and apply it with a spray mister. It may not be necessary from what I observed with the flame test. I'm not worried about resistance to fuel or oil since my engine doesn't leak. It slung water from the back of the waterpump a few years ago with the muffs but I have since replaced it and it is bone dry.

My greater concern is that it stays attached. The foam has a pretty robust adhesive backing. The spray adhesive I applied on the bare fiberglass surfaces is:

https://images-na.ssl-images-amazon.com/images/I/719gonFoLSL._SL1500_.jpg

The product reviews gives it high ratings for staying put. One thing I noticed is about a 1/2" wide strip of the foam along the factory edge didn't have the self-stick adhesive applied all the way, so I added more spray where needed. I prepped the fiberglass with a wire brush & hosed it off and let it dry. After applying the adhesive and foam, I went over the whole thing heavily with a roller to make sure it was fully adhered. I try pulling an edge away and it is stuck good.

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