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The issue wasn't that they used foam. The issue was the type of foam and the process of adhering the foam to the vinyl. This is the reason that the problem doesn't exist in later Amel SMs.
On Sat, Feb 22, 2020, 10:29 AM Matt Salatino via Groups.Io <firstname.lastname@example.org
Many boat manufacturers used similar, foam-backed vinyl. All had sagging issues as a result. None should be using it today, unless they don’t care what happens 8-10 years down the road, after warranties are long gone. On our previous boat (as did many manufacturers), we fixed the problem by removing the panel, removing the vinyl, cleaning the deteriorated foam off both the panel and vinyl, and reflux got with contact cement. Hundreds of boats, if not thousands did this.....
On Feb 22, 2020, at 10:50 AM, CW Bill Rouse <brouse@...
I normally say something like, "trust the original design." But, "trust" is what got us to this point. I think Henri Amel trusted the polyfoam manufacturers to deliver a good product to the vinyl covering manufacturer. And, I believe that Henri Amel trusted the polyfoam backing on the headliner to last a lot longer, but so did most automobile manufacturers at the same time period.
I really do not have the kind of thermal engineering background to be sure that the following comments are 100% correct, but I believe they are:
An Amel is an unusually dry boat, however, one can change the original design and unintentionally create barriers that aid/cause moisture to form from condensation because of a difference in temperature. This is sometimes inadvertently done by modifying refrigeration or air conditioning, and I assume could be done by adding a non-breathing barrier to the ceiling where the outside temperature and inside temperature can merge to create condensation. I believe that I am correct when I say that most boat builders use materials that breathe in these situations (including the foam layer on the backside of the vinyl in an Amel).
I suggest recovering the ceiling with a foam-backed vinyl from a "trusted source."
On Sat, Feb 22, 2020 at 9:17 AM Chip Beaman <chip@...
Thank you Bill, I have read and spoke to folks about the daunting task of headliner replacement. To do it right, replacing the headliner is the right thing to do, I guess, that’s what I am trying to find out. The current owner did a fantastic job covering it and I love the look of it. My great concern, is mold growth in areas of higher humidity. Mold mitigation strategies are a given, regardless of the current liner solution. I just don’t know if it is a bridge to far to expect normal processes to keep mold from growing between the old liner and the covering material (painted plywood)???????
Thank you Sir for all you do.
Future Amel Owner