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Thread: How To Remove Undercoating Sprays

  1. #1
    Non-MVC Supporter Military Jeeper's Avatar
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    Default How To Remove Undercoating Sprays

    The PO sprayed 3M undercoating spray in the tub of the Jeep and I can't get. I tried a abrasive sanding disc today with no luck. I've done some research and the only things I've seen that work are very time consuming (Torch it and scrap it, dry ice).

    Is there anyone out there that has any experience with the removal of this stuff easily. I don't have access to a sandblaster so please don't recommend that (otherwise I'd be using it).

    Thanks for your time.
    NOTE: I DO NOT ENDORSE MOUNTAIN VALLEY CUSTOMS (MVC) FOR ANY 4x4 MODIFICATIONS - PM ME IF YOU HAVE QUESTIONS WHY!

    (To those who wonder, I am NOT the club founder, this has been my screen name for over 10 yrs on all other forums and ironically this site is called "Military Jeepers"......contact miljeep for forum related questions)

  2. #2
    Administrator miljeep's Avatar
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    Good luck. I tried to google this for 30 minutes and came up with nothing.

  3. #3
    Hard Coal, Hard Core Dragline's Avatar
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    When I did my CJ frame, I had to torch it, scrap it (Razor blade and Putty knife) and then sand blast the really heavy areas that were undercoated on the frame. Talk about time consuming...
    Last edited by Dragline; 03-01-2008 at 09:43.

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    Bobble Head Jeeper trailsnail's Avatar
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    That really blows. Why would someone do that? Haven't they heard of Herculine, etc. Sorry I have no idea, but wanted you to know that I feel the pain.

  5. #5
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    I've done several vehicle restorations and there are only a few effective ways to remove undercoating...

    1. Is to acid dip the part, or in your case the tub of the vehicle.
    This isn't as expensive as you might expect, but it is a problem stripping everything off the tub to get it prepared for the acid dip.

    2. A product like 'Zip Strip'.
    Again, it's a chemical stripper that will take the coatings off to bare metal, and you have to watch getting it into seams.
    It's 'Acid Dip' on a smaller scale.
    These chemicals are VERY caustic and should be handled with the proper safety equipment!

    3. If you are doing a very small patch, try a wire wheel in a drill.
    It's messy and the undercoating will plug up the wire wheel very quickly, but you WILL get down to bare metal.
    The wire wheels are sacrificed in this case since there really isn't any way to get the 'Goop' out.

    4. Torch or heat gun and scraper, and then use a wire wheel.
    This is dangerous since the undercoating can and will catch fire if you overheat it enough!

  6. #6
    Senior Member E5EDDIE's Avatar
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    about two pounds of C-4 might be enough!
    "What is life without honor? Degradation is worse than death!"
    -Thomas J."Stonewall" Jackson

  7. #7
    Looking for A Jeep ArmyFSJ's Avatar
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    I use C-4 most every day and 2 lbs will only put a dent in it. Now a 2 hundred pounds might do it.
    2006 Unlimited

    I will not Tiptoe through life only to arrive safely to my death, with no scars or stories to tell. I will enter Hell sideways in a Burning pile of rubble, with a smile on my face asking if I can do it again !???

  8. #8
    Administrator miljeep's Avatar
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    didn't they talk about coating the HMMWV under carriage with rhino liner a few years back. Something about how it helps to absorb the blast and changes the way the metal reacts during the blast? That would probably be a good sign that the stuff is tough to get off.

  9. #9
    Administrator korisu56's Avatar
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    Yeah, mythbusters, or someone, coated a house in rhino lining or something to that effect. They blew something up right next to it, and it only took out the window I think.

  10. #10
    Buy My Bike! 05warrior's Avatar
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    Smash Lab did that, and it actually kinda worked.

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