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  1. #1
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    Question Regarding Rust

    Posted here as I believe you folks have most knowledge about my issue.

    I am buying a steel frame bike. Suppose I scratch the frame through the clear coat and paint, in other words down to steel.

    I assume bare steel will rust and slowly degrade integrity of the frame.
    Now down the line I have frame failure. I imagine manufacturer of bike would not stand behind lifetime frame warranty as it was not a "defect".

    I would not expect them to cover this as opposed to a weld failure.

    So in the event I do scratch frame do I just cover it with clear nail polish or what?

    Frame is "Cro moly" if that matters. Made by Kona.

  2. #2
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    Sure, nail polish or something could help.
    A scratch getting rusty isn't going to cause a frame to fail though.

  3. #3
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    Quote Originally Posted by adarn View Post
    Sure, nail polish or something could help.
    A scratch getting rusty isn't going to cause a frame to fail though.
    Appreciate the reply.

    I had heard from an auto body tech that once rust starts it will continue to oxidize (like a slow erosive process) hence I assumed eventual failure due to loss of structural integrity.

  4. #4
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    Unless it's somewhere hidden that's regularly soaked, like a chainstay bridge, it's not a problem.

  5. #5
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    Over a very long time period (50 years?) this will certainly be the case, but the initial layer of rust pretty much seals the metal beneath unless it's being soaked on a regular basis. Modern steels used for bikes also have pretty high chromium content, so they don't rust all that easily.

    In short: don't worry about it, but putting some nail polish on a scratch is a fine way to ease your mind if it makes you feel better.

    -Walt


    Quote Originally Posted by drjay9051 View Post
    Appreciate the reply.

    I had heard from an auto body tech that once rust starts it will continue to oxidize (like a slow erosive process) hence I assumed eventual failure due to loss of structural integrity.
    Waltworks Custom Bicycles
    Park City, UT USA
    www.waltworks.com
    waltworks.blogspot.com

  6. #6
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    Quote Originally Posted by Walt View Post
    Over a very long time period (50 years?) this will certainly be the case, but the initial layer of rust pretty much seals the metal beneath unless it's being soaked on a regular basis. Modern steels used for bikes also have pretty high chromium content, so they don't rust all that easily.

    In short: don't worry about it, but putting some nail polish on a scratch is a fine way to ease your mind if it makes you feel better.

    -Walt
    Thanks, Walt. I'll sleep well tonight. Salt Lake City? Great skiing but that's another topic.

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