Rubberized Undercoating

Discussion in '1965 - 1973 Classic Mustangs -General/Talk-' started by kilgorq, Oct 19, 2009.


  1. kilgorq

    kilgorq New Member

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    Has anyone used Rustoleum Rubberized undercoating. How well did it work?
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  2. tx65coupe

    tx65coupe Active Member

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    I won't put any of that rubberized undercoating on my car. In my opinion, it will just end up holding in moisture and causing rust in the long run.
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  3. kilgorq

    kilgorq New Member

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    I have heard about 50/50 on that. Some say it will some say it wont. I have never seen a car with rust under the undercoating. That does not mean it doesn't happen. There wasn't any rust under the undercoating on my 69. I'm not sure how good of a comparison that is though the car had very little rust anyway.
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  4. tx65coupe

    tx65coupe Active Member

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    When we began work on our 65 there was some rust under the undercoating in places. Luckily it wasn't bad and it didnt need to have sheel metal replaced. The rust was there though.

    I have seen other cars that were rusted out behind the undercoating.
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  5. kilgorq

    kilgorq New Member

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    Well This makes we wonder if I should do it this way.

    The tentative plan.

    Prime with epoxy.
    Seam Seal.
    Second coat of Primer
    Undercoat 3 Medium Coats.
    Paint semigloss black 2 to 3 Coats.

    I would really like to hear from as many people with experience either way.
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  6. GNGREN

    GNGREN Member

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    are you sure that the undercoating wasn't sprayed over the rust to hide it at some point? I am always suspicious when looking at a car that has a nice or to fresh of a looking undercoat on it.
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  7. ks65stang

    ks65stang Member

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    I plan to repair my bad rust, then wire wheel the entire underside, spray a rust encapsulator, prime then coat w/ flat black and call it good. My car will likley see little rain/snow.
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  8. tx65coupe

    tx65coupe Active Member

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    I don't think it was to hide the rust. At least not on my car because the rust was very minimal and the undercoat was ancient.

    On the other cars I have seen, I'm sure some of them could have had the undercoating applied to hide the rust. There is really no way of knowing. I know that the undercoating on some of them was really old as well.
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  9. tx65coupe

    tx65coupe Active Member

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    This is basically what we have done to ours. I can't remember exactly what all we did. I was 15 and this was over 15 years ago that we did that work on our car.
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