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

[Don <don_nsx@xxxxxxxxxxxx>]

> Mark,
> The foam I was looking at, is called Great Stuff and is sold by Dow 
> Chemical.
> The part below is the info off their website describing the difference 
> between "open cell" and "closed cell" foams. Although they don't say water 
> proof, I sprayed this stuff into a piece of frame rail, let it dry, 
> weighed it and then dumped it into water over night. The next day, after 
> blowing off the outside, the part weighed the same as before, indicating 
> that it did not pick up any water.
> I think there are some cautions.
> If the foam oozes out of areas, it should be wiped off before it dries, so 
> that you get that tough skin that forms. After it dries, you can cut it 
> off with a knife, but I think it opens up the "pores" and might allow 
> water penetration.
> I'm not advocating that anyone else do this but I feel comfortable enough 
> with what I've seen to use it on my car. I'm going to put it in the frame 
> rails, behind the rear wheel cavity (between the outer fender and inner 
> fender) and the door sills.
> If I'm still around in 10 years I'll update what happened. Be advised that 
> this is NOT a daily driver (more a sunny day in the summer driver) and so 
> no matter what I do, I don't think it will radically affect the outcome.
> Also, for those asking about bedliner for the interior of their cars, I 
> used it on my car and was quite pleased with the result. That stuff is 
> tough as nails and sticks hard. I then used 2 layers of roofing membrane 
> for sound deadener. That's a product that they use to seal a leaky roof 
> and comes in sheets about 1/8 in thick. Two layers gave me about 1/4 in of 
> sound relief. The only thing with that is, I wouldn't want to have to 
> remove it to do work on the car.
> Cheers,
> Don
> 1970 AMX
> "The older I get, the better I was."
> There are two key differences between latex foam and GREAT STUFFT, which 
> is a polyurethane foam:
>
>  1.. Latex foams are typically "open cell" and, as a result, can take on 
> water. In fact, the same properties that allow you to wash latex foam off 
> your hands with water also mean that the cured foam can absorb water. This 
> can cause wood rot or deterioration in areas where wet latex foam is next 
> to wood, such as a window frame. In contrast, GREAT STUFFT is a 
> closed-cell foam. It forms a water-resistant outer coating when cured.
>
>
> ----- Original Message ----- 
> From: <Wrambler242@xxxxxxxxxxx>
> To: "Don" <don_nsx@xxxxxxxxxxxx>; "AMC/Rambler owners, drivers and fans." 
> <amc-list@xxxxxxxxxxxx>
> Sent: Thursday, December 20, 2007 11:13 AM
> Subject: Re: [Amc-list] Bedliner/foam in rails
>
>
>> I'll bite.
>> Exactly which foam are you looking at?
>> Even marine purposed stuff I have seen says that if the outside surface 
>> is penetrated it must be sealed with a sealer or it will absorb water!
>>  The shiny outercoating is the water proof area. Internally it is not so 
>> great.
>> A true waterpoof foam I would be interested in seeing a link too!
>>
>> --
>> 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: Don <don_nsx@xxxxxxxxxxxx>
>>> Frank,
>>> Okay, I hear you loud and clear on the foam, but is this something that 
>>> we know
>>> instinctively or is there some research and history behind it.
>>> The foam I'm talking about is meant to seal moisture OUT. Moisture does 
>>> not
>>> penetrate it. You can submerge it in water overnight and take it out and 
>>> cut it
>>> in half and its dry as a bone. It also sticks to whatever material it is
>>> touching like baby @(*%#! to a blanket.
>>> My guess, is that, if your panel is dry, it shouldn't be a problem.
>>> I think I will try to talk to the people who make the stuff and see what 
>>> their
>>> testing tells them.
>>> Don
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> 

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