www.iFourWinns.com

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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gale
'96 200 Horizon
VP Cobra SX 5.7GL

Looks great!

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Current:
2000 Sea Ray 380 Sundancer "still Livin the Dream"

Past
2002 268 Vista 5.7 GXI "Livin' the Dream"
1996 Rinker 192 Captiva. "The Simple Life"
1999 Yamaha XLL 1200 Waverunner.
1976 Mercury Marquis tri hull 120 hp

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.

_________________
gale
'96 200 Horizon
VP Cobra SX 5.7GL