Re: [Amc-list] Bedliner/foam in rails

["Garry Nordstrom" <gasnordstrom@xxxxxxxxxxx>]

Mark:  I am no doing the resto on the cj8 frame, I think the safe way is to 
drill water escape holes in the frame to allow moisture to evaporate, this 
was a common problem in the ford retracable hard top as well as the tail 
lights of the car.
Face it, metal has a shelf  life and we also have it, as long as lasts for 
my lifetime, I will be happy
Garry
----- Original Message ----- 
From: <Wrambler242@xxxxxxxxxxx>
To: <oldcars@xxxxxxxxx>; "AMC/Rambler owners,drivers and fans." 
<amc-list@xxxxxxxxxxxx>
Sent: Wednesday, December 19, 2007 7:43 PM
Subject: Re: [Amc-list] Bedliner/foam in rails


> I'd forgotten all about the fact that even closed cell foam is not 100% 
> closed cells.
> It retains moisture.
> I once had a boat that a section of floor rotted in.
> when I pulled it out I found a gigantic water logged chunk of foam below 
> it.
> The boat manufacturers inject the foam for floatation. Works great for 
> many yearsbut eventually waterloggs having the oposite effect.
>   Should this happen in a frame rail the results would be disasterous. I'd 
> imagine it would be akin to stuffing the rail full of wet soggy leaves and 
> letting it sit. Not pretty...
>
> --
> Mark Price
> Morgantown, WV
> 1969 AMC Rambler, 4.0L, EFI, T-5
> 2004 Grand Cherokee Laredo, 4.7L, Quadratrc II
> " Chronic Pain Hurts"
>
> -------------- Original message ----------------------
> From: "oldcars@xxxxxxxxx" <oldcars@xxxxxxxxx>
>> I think that in the early 80's the factory started filling in the frame
>> rails with paraffin wax, to keep out moisture and dust, as a part of the
>> multi-step process for reducing rust.
>>
>> Perhaps this could be tried, if you could get a clean and perhaps treated
>> surface on the inside of the frame rails?
>>
>> Original Message:
>> -----------------
>> From: Frank Swygert farna@xxxxxxx
>> Date: Wed, 19 Dec 2007 15:28:43 -0500
>> To: amc-list@xxxxxxxxxxxx
>> Subject: Re: [Amc-list] Bedliner/foam in rails
>>
>>
>> It's one of those "sounds good in theory, doesn't work in practice" 
>> things
>> Don. The problem is the foam isn't 100% moisture proof. So what little 
>> does
>> get in can't get out, and you end up with worse rust (in spots) than if 
>> the
>> area was left open with good drain and air holes. The best thing you can 
>> do
>> is enlarge the weep holes near the bottom of the rails (there should be
>> some from the factory, sometimes just small gaps in seams that are hard 
>> to
>> find) and make sure air can get in from the top. You can't keep 100%
>> moisture out, so the idea is to make sure it drains or drys out instead.
>> That doesn't hurt a painted surface, standing water does though! Most
>> chassis rails rust out due to fine dust that collects over the years
>> retaining moisture. If you could keep everything washed out it would be
>> better than foam! Coating the inside with something to protect the bare
>> metal/primer then having adequate drain/air holes is the key.
>>
>> ----------------
>> Date: Tue, 18 Dec 2007 16:04:06 -0500
>> From: Don <don_nsx@xxxxxxxxxxxx>
>>
>> Why not fill the channels and subframes with expandable foam like they 
>> use
>> to seal house foundations.
>> Its not the same as the stuff they're using in new cars but it would keep
>> the moisture out and that would slow the rusting process.
>> I guess it helps with sound deadening too.
>>
>> -- 
>> Frank Swygert
>> Publisher, "American Motors Cars"
>> Magazine (AMC)
>> For all AMC enthusiasts
>> http://farna.home.att.net/AMC.html
>> (free download available!)
>>
>>
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