Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Goon
    Join Date
    Jul 2008
    Location
    Ypsilanti, MI
    My Bikes
    Rocky Mountain RC30, Soma Sport Fixed
    Posts
    864
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Oxalic Acid and minor Frame rust

    So I posed this question in the Bike mechanic forum too, but was recommended to ask it here by the SS/FG forum.

    I have an old early 70's peugeot UO-8 that I am restoring, and It has some minor rust here and there on the frame.

    A guy I know who restores old frames suggested that I use some oxalic acid. He had said to dissolve a bit into some warm water, soak some paper towel in it, and then wrap the paper towel around the rusted parts, let soak for a bit, and then wipe off.

    Well I tried that, and while it did help remove SOME of the rust, it didn't remove that much. He said that sometimes, if it is being difficult, I could make a concetrated paste out the OA, and maybe even add some Zud or Barkeepers to it, then scrub the rust with something that won't scratch the paint.

    Which is what I am planning to to next, then I have some rustoleum stops rust protective primer to put on once I have removed the rust.

    The question I have is, is the paste method the optimal way to remove the tougher rust from the frame? Is there a better way?

    I don't want to re-paint the whole frame, my plan was remove the rust, apply some rustoleum primer, then just do some paint touch ups, so I don't have to remove the decals.
    No matter how bad things get, they can't get any better, and they can't get any worse, things are what they are, so you better get used to it Nancy, quit your B*tchin'

    -Church

  2. #2
    DRF aka Thrifty Bill wrk101's Avatar
    Join Date
    Jan 2008
    Location
    The NC Mountains
    My Bikes
    Too many to list, all vintage
    Posts
    19,568
    Mentioned
    68 Post(s)
    Tagged
    1 Thread(s)
    If you are just touching up some spots, I would use a rust converter primer instead. I am a huge fan of oxalic, I have a fork and several parts soaking right now. But I use the rust converter if I am just going to touch up a few spots. Note, whether you use the oxalic or the rust converter, the rust needs to be exposed. So if you have rust under the paint in spots, you will need to expose it. I carefully use a dremel for that task.

  3. #3
    Goon
    Join Date
    Jul 2008
    Location
    Ypsilanti, MI
    My Bikes
    Rocky Mountain RC30, Soma Sport Fixed
    Posts
    864
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I was going to use a Rust converter, which I have, but the frame is white, and all the rust converters I have seen turn to black, not a HUGE deal, but still.
    No matter how bad things get, they can't get any better, and they can't get any worse, things are what they are, so you better get used to it Nancy, quit your B*tchin'

    -Church

  4. #4
    DRF aka Thrifty Bill wrk101's Avatar
    Join Date
    Jan 2008
    Location
    The NC Mountains
    My Bikes
    Too many to list, all vintage
    Posts
    19,568
    Mentioned
    68 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by cg1985 View Post
    I was going to use a Rust converter, which I have, but the frame is white, and all the rust converters I have seen turn to black, not a HUGE deal, but still.
    I thought you were touch up painting it? I use rust converter even after oxalic, as a final "kill" of any remaining rust, as a preventive measure. I never go straight to touch up paint.

  5. #5
    Senior Member Chris_in_Miami's Avatar
    Join Date
    Nov 2007
    Posts
    4,490
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Let me add that you should not mix oxalic acid to a "paste" consistency, that would be way too concentrated!

  6. #6
    )) <> (( illwafer's Avatar
    Join Date
    Mar 2008
    Location
    San Diego, CA
    Posts
    2,400
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    try naval jelly (same thing). follow the instructions and don't leave it on too long. rub hard with a rag when removing it. repeat as necessary. follow it up with some clear nail polish or something else.

  7. #7
    Banned
    Join Date
    Jan 2007
    Posts
    5,285
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Chris_in_Miami View Post
    Let me add that you should not mix oxalic acid to a "paste" consistency, that would be way too concentrated!
    It is impossible to mix oxalic acid to a paste. It is, however, quite easy to make a paste of Zud Cream Cleanser, Zud Powder Cleanser and OA if you need something to cling to a small section.

    BTW, illwafer, Naval Jelly is phosphoric acid, not oxalic acid. Not the same thing.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •