Noob Attacking rust holes. Opinion/Thoughts? [pics]

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  • Earendil
    E30 Mastermind
    • Jun 2009
    • 1662

    #1

    Noob Attacking rust holes. Opinion/Thoughts? [pics]

    Ladies and Gentlemen, this noob is finally going after the rust hole/s on the floor of his poor E30. I found these spots this last spring when I removed the carpet, and the plan was to ignore them until they went away. Well they haven't gone away, so time for plan B.

    I that more than likely the "proper" way to do this is to take it to a shop, and have them cut everything out and weld in a new floor piece. Sadly, I don't have a few hundred to throw at the track rat right now. And quite frankly, I don't really care that there is a hole in the floor. What I do care about is stopping the rust from spreading, and making sure it isn't structural.

    So without further ado, here are the pictures I took today as I finally started to tackle it. The location is just behind the passengers seat. The bolt hole in the pictures is the rear right bolt hole for the seat.

    The big ugly. Sander left in picture to help with scale.




    Not quite holes yet. But I believe the metal is toast here. Haven't ripped away the underside yet.


    The underside after the coating has been pealed back some.


    Turns out my car might be an autobot...


    After a wirebrush on drill has been taken to it. Local small town hardware store didn't have a wire brush for the angle grinder.


    Top side after some more sanding and picking away at the bad metal.


    Another angle.


    It was at this point that I realized I did not have any tin snips, and was unable to cut the hole out very nicely.

    So what do you guys think? I have some pink gel from NAPA that's supposed to help eat up rust, and a bottle of black rust protecting spray paint. I'm inclined to just use that with the addition of some undercoating on the bottom side to keep this all relatively safe until I can have someone cut and weld it. But what do I know...

    Thoughts?

    Alternatively, if people really thought this was not structural, I could have a buddy "practice welding" a sheet of metal in there.
    It is my track rat after all. Pretty is not required, but safe is and less money over time is :)

    Thanks for any thoughts or opinons you'd like to share. Otherwise I'll probably chronicle my progress here.
    -------------------------------------------------
    1989 - E30 - M20B25 - Manual. Approx 300,000+ miles - Track Rat & Weekend Fun
    2000 - E46 - M52TUB28 - Manual. Approx 130,000 miles - [not so] Daily Driver

    sigpic

    I'm looking for a Lachssilber Passenger Fender and Hood. PM if you have one or both to sell!
  • rares
    Mod Crazy
    • May 2010
    • 730

    #2
    hehe, wow, that is some interesting rust spots... good work getting them taken care of...

    be safe
    sigpic

    Comment

    • Earendil
      E30 Mastermind
      • Jun 2009
      • 1662

      #3
      Originally posted by rares
      hehe, wow, that is some interesting rust spots... good work getting them taken care of...

      be safe
      Safe is a good suggestions. I had zero desire to call up the Doc for a tetanus shot :)

      I didn't end up doing much more past what the pictures show, just a few tiny spots buffed out here and there. The weather started to turn so I sprayed some One-Step on it, and sprayed some rubberized undercoating on the bottom side. I may duct-tape-the-shit-out-of-it later to prevent water from entering through the whole, and to keep the One-Step from scratching/rubbing off.

      I'm hoping this holds me through the winter.
      -------------------------------------------------
      1989 - E30 - M20B25 - Manual. Approx 300,000+ miles - Track Rat & Weekend Fun
      2000 - E46 - M52TUB28 - Manual. Approx 130,000 miles - [not so] Daily Driver

      sigpic

      I'm looking for a Lachssilber Passenger Fender and Hood. PM if you have one or both to sell!

      Comment

      • nrubenstein
        No R3VLimiter
        • Feb 2009
        • 3148

        #4
        Any idiot can weld that up with a MIG. I mean, I can weld. In a polo shirt and khakis no less. Cut that stuff out with an angle grinder and drop in some replacement sheet. The car is held together by tiny spot welds at huge intervals, so even a really spectacularly incompetent welder can get a seam that holds that well across the sheet.

        It's not hard. At all. Really good welds and pretty welds are hard. You can do solid enough welds for this job inside of 60 seconds after someone hands you a MIG.
        2006 GMC Sierra 2500HD 4WD LBZ/Allison
        2002 BMW M3 Alpinweiß/Black
        1999 323i GTS2 Alpinweiß
        1995 M3 Dakargelb/Black
        - S50B32/S6S420G/3.91
        1990 325is Brilliantrot/Tan
        1989 M3 Alpinweiß/Black

        Hers: 1996 Porsche 911 Turbo Black/Black
        Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd

        sigpic

        Comment

        • poopin04
          E30 Fanatic
          • Jul 2010
          • 1396

          #5
          I'm a ashamed to say it but I horribly welded my hole in my car. Pretty much welding for the first time, I thought it'd be like sodering, but i guess now. So in order to make sure of no incoming water, I bought Por-15 brand Epoxy because I was also ordering their rust protection paint. I hear great things from the company so i figure it would be the right company product for the job. And i must say, that shyte works like a G! And I have no leaks at all, but I never did test to see if it was leaking with my beginner level welding.
          Click here to leave me feedback on our transactions. :p

          Comment

          • nrubenstein
            No R3VLimiter
            • Feb 2009
            • 3148

            #6
            After welding, hit it with seam sealer........
            2006 GMC Sierra 2500HD 4WD LBZ/Allison
            2002 BMW M3 Alpinweiß/Black
            1999 323i GTS2 Alpinweiß
            1995 M3 Dakargelb/Black
            - S50B32/S6S420G/3.91
            1990 325is Brilliantrot/Tan
            1989 M3 Alpinweiß/Black

            Hers: 1996 Porsche 911 Turbo Black/Black
            Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd

            sigpic

            Comment

            • KMOSES
              E30 Addict
              • May 2010
              • 591

              #7
              POR-15 and fiberglass mat would work for that. Check out my old thread;


              Good luck!

              Comment

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