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Expanding foam as a rust preventave?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Cavalry, Sep 23, 2001.

  1. Cavalry

    Cavalry 1/2 ton status

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    Ok here is my idea. I live in the saltbelt and everything seems to rust from the inside out. It is near impossible to keep all the crap out of the crossmembers all winter long. I am currently replacing floors/crossmembers in my rig. I am por15ing everything as I go. How about filling the crossmembers/ rockerpannels or any other cavity with expanding foam to keep the crap out and keep it from rusting?

    "There is a fine line between hobby and mental illness"
    Luke
    84 K5
     
  2. kumma

    kumma 1/2 ton status

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    its seems like it would work but in my experiences it just acts like a sponge, keeping the moisture in close contact with the metal. i've dug foam out of many cars that were used as rust reair and many were still damp.

    "Why is there a <font color=red>watermelon</font color=red> here?"
     
  3. Thunder

    Thunder 3/4 ton status

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    Dont do it!!
    The foam will hold moisture and road chemicals and accelerate rust. Espically in areas that get wet regularly(quarter pannels, Rockers,wells,ect.
    I had a Travelall that was rusted out pretty bad cause someone used foam to do some quickie body repairs on it.
    It was a real PIA to dig out all that damp foam and do the repairs right.

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze>http://coloradok5.com/gallery/Thunders-Blaze</a>
    <font color=blue>NEVADA: Where the pavement ends, and the West begins.</font color=blue>
     
  4. Pure Insanity

    Pure Insanity 1/2 ton status

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    Check w/ body shops to see what they use for rust proofing. They have guns w/ wands that can reach just about anywhere.

    I get all the exercise I need pushing my luck! [​IMG]
     
  5. newyorkin

    newyorkin 1 ton status

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    I used foam on my old truck to fill in the big holes in front of the rear wheel wells and keep the kids toys from falling out... Dunno how it did as a rust preventor, but the stuff I used was anti-moisture and dried with a kind of water repellant glaze on it... I know where the truck lives right now, so I should go back and see if it slowed the rust. That was about 2 or 3 years ago.

    BTW, I can see the usual foam holding moisture in, though. Whatever I used was different stuff though, and I can't remember what it was or where I got it.

    Ratch
    <a target="_blank" href=http://k5.8m.com>k5.8m.com</a>
    **Ever stop to think... Then forget to start again?**<P ID="edit"><FONT class="small">Edited by newyorkin on 09/23/01 10:44 AM.</FONT></P>
     
  6. ftn96

    ftn96 1/2 ton status

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    Ditto!!! ITs a liquid sponge!!!! Bad idea!!!!!

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  7. michaelm

    michaelm 1/2 ton status

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    taradon used it to insulate the entire cab on his 92 dodge cummins. it looks pretty water resistant/closed cell to me
     
  8. TorkDSR

    TorkDSR 1/2 ton status

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    Great Stuff makes a black spray foam that is used in backyard ponds. the faom has to be watertight so that it does'nt absorb chem's then leak back into the pond to kill the fish. check your local high-en garden center.

    Tork DSR
    I just got a winch, it takes the fun out of things.
    http://www.torkpig.homestead.com
     
  9. Cavalry

    Cavalry 1/2 ton status

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    I went on the great stuff site and could not find the product you are speaking about....they have regular foam, adheasives and such what am i missing?

    "There is a fine line between hobby and mental illness"
    Luke
    84 K5
     
  10. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    First off Great stuff is not the same stuff they use in the auto industry. The auto industry uses it for 2 reason. It stiffens up the section so they use it in rockers. It also dampens noise. The problem on a K5 is there are weep holes in the rockers. this is so that any water that condisates on the insides of the A/B pillers, windsheild frame, has a place to go. Sealing the inside of the rockers would block those holes. THe best thing to do is either take it to a rust proofing place that has the wands to do the job or to buy a kit at a auto paint stor, J.C. Whitney or Eastman and seal it up that way. The POR 15 will go a long way. But before you weld in the rockers if you could do some spraying up the a-piller and B-piller that would help. The tail pan is another big problem area to do some work on.

    I don't need no damn shop manual, I got a pornographic memory.
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  11. TorkDSR

    TorkDSR 1/2 ton status

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    hmmmm... let me think, maybe it wasn't great stuff, but i am not crazy...

    Tork DSR
    I just got a winch, it takes the fun out of things.
    http://www.torkpig.homestead.com
     

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