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

[Frank Swygert <farna@xxxxxxx>]

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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