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Thread: My Doors Are Rusting Again ! Anyone got a good fix ?

  1. #1
    Join Date
    Jan 2004
    Location
    Nashville, TN
    Posts
    982

    Default My Doors Are Rusting Again ! Anyone got a good fix ?

    The last time around I wire brushed the doors down to bare metal. Used a zinc based self etching primer, went over that with paint. I then put new rubber strips on the bottom with silicone to seal them off. I now have the rust back again. Looking for suggestions on how to repair this problem once and for all.
    Derek A.
    90 535i 5 Speed - Style 5 17"

  2. #2
    Join Date
    Jan 2004
    Location
    Bloomsbury, NJ
    Posts
    132

    Default Hey Derek...not sure exactly what products you used (m)

    ...but last Fall, I went through this myself after reading this was a common problem with the E34. After pulling off the strips from all 4 doors, turned out only my driver's door had any rust, so I lightly sanded it and applied a few light coats of POR-15, followed by a thin top coat of Chassiscoat black (same company -- no affiliation). I haven't seen any rust, however, I also never reinstalled the rubber strips either. Seems they're good at trapping water in there.

    Anyway, I've used POR-15 on old rusty floorboards of my old jeep, and a handful of other auto and non-auto applications, and I've yet to see any rust return. Just my $.02....YMMV.

    Hope that helps,
    Tim G.
    '91 535iM

  3. #3
    Join Date
    Feb 2004
    Location
    Philippines
    Posts
    474

    Default

    I have some rust spots on the inside of my trunk, on the sides, behind the side carpetting... how do I get rid off these spots? Would it be recommended to weld a new piece of metal over this part to reinforce it after the rust has been sanded off?

  4. #4
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,922

    Default

    move to the south or somewear without road salt, sell rusty bimmer and buy local non rusty e34, never think about automotive cancer again, live happly ever after
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  5. #5
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,843

    Default Hint Derek!

    Silicone attracts moisture big time! Ever see people put it around windshields to stop them from leaking and the next year the whole window falls in? It's from the use of silicone. Use something else like urethane to fit the rubber back up there after you fix the rust. Also let the paint and primer "breathe" out for a couple weeks before you lock the vapors in with a sealant.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  6. #6
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,922

    Default

    yep, it's fun when somebody silicones in their tail lights, after a couple years you just push em out the bolts are just for looks
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  7. #7
    Join Date
    Feb 2004
    Location
    Philippines
    Posts
    474

    Default

    Does anyone have any experience with Ziebart Rust Treatment? I'd like to have my spots done, but I was told that their rust proofing screws up BMWs coating. Any comments on Ziebart Rust treatments (the one that turns rust into some harmless compound)? Thanks!
    Last edited by jplacson; 03-07-2004 at 01:53 PM.

  8. #8
    Join Date
    Dec 2003
    Location
    Wellington,New Zealand
    Posts
    3,868

    Default you have to "neutralize" the rust first.

    there are many product for this but i cant think of one.....check out your local hardware store, "anti rust" primers will include a reference to some prior treatment.Remember.....rust never sleeps
    Gone but not forgotten

  9. #9
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,843

    Default Rust Mort turns rust into a black looking rust thats supposed to be paintable but you

    cant sand it prior or after treatment or it wont transform it. If it has rust pits to do it correctly you have to use an acid wash to get the rust out but make sure to wash all the acid out (baking soda) or you will paint the rust and caustic acid in there which is not good (ask my old 57 Dodge that I gave away to a good home)
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  10. #10
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,922

    Default

    the car disolved did it
    all america wants is cold beer warm cat and a place to take a poop with a door on it

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