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  1. #1
    Junior Member
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    Paint on aluminum

    Doe's paint stick to aluminum? I notice on my trek OX1 the paint rubs off everywhere the bike leans against. It is also rubbed of on the fork were the wheel been taken off and on.

  2. #2
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    If it's the original paint the factory may not have primed the frame correctly.

    Having just repainted a frame I can tell that getting pain to stick to aluminum is f!@#ing difficult - 3 coats of primer, light sanding, 3 coats of paint, wet sanded, then clear coat and the %#$@ paint still chips.

    Fortunately aluminum doesn't rust so it's not the end of the world.

  3. #3
    Senior Member dennisa's Avatar
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    Best practice to paint AL is powder coating or anodizing
    --
    2010 Cannondale CAAD9 5 52cm Charcoal Gray
    Four wheels good, two wheels better!"
    Of all my imaginary friends, I don't think there was one that I didn't end up having to kill.
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  4. #4
    Senior Member Retro Grouch's Avatar
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    I'm told that aluminum requires a special, etching primer.

    When I repainted my Raleigh Techium bike frame for my fixed gear I didn't know that and just used the same Rustolium primer that I always use. It came out OK and hasn't chipped yet. Maybe I just lucked out and maybe the chemicals that I used for stripping off the old paint etched the aluminum main tubes.

  5. #5
    Bianchi Goddess Bianchigirll's Avatar
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    while Aluminum does not 'rust' it does oxidize. when I was in the service we used to use something called zinc chromate primer on aircraft. I think that while you do need special primers the frame prep and how clean everything is can be just as important. are you orginal owner? how old is your trek?
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo, '86 Volpe, '89 Axis, '79 Mixte SOLD, '99 Mega Pro XL Ti, '97 Ti Megatube, , '90 something Vento 603,

    Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '86 Bertoni (sold), '09 Motobecane SS, '98 Hetchins M.O., '09 K2 Mainframe, '89 Trek 2000, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

  6. #6
    Senior Member BlazingPedals's Avatar
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    Quote Originally Posted by dennisa View Post
    Best practice to paint AL is powder coating or anodizing
    Low temp powder coating? Oven temps for the standard stuff are pretty high, and might affect the heat treating of the frame.

  7. #7
    Senior Member dennisa's Avatar
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    Not sure how they do it but there are services that offer powder coating for AL
    --
    2010 Cannondale CAAD9 5 52cm Charcoal Gray
    Four wheels good, two wheels better!"
    Of all my imaginary friends, I don't think there was one that I didn't end up having to kill.
    Cat Meter | Cat5xxx-------Cat4

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