Rust under clear coat

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  • Has anyone got experience dealing with rust under clear coat on a raw frame? Picked up this Kona recently 2nd hand and it's more extensive than I thought. I'm reluctant to let it get any worse.

    Considering using a wire brush drill attachment to remove the rust and then use clear nail varnish) spray clearcoat , but have tested a small area and the wire brush completely strips away the dark grey finish. I'm note sure if the steel will darken again with time or it's a tint in the clear coat ..

    Any other suggestions ?


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  • Ignore it or paint it. You can’t prevent rust if you want it clear coated, it’ll rust again even if you remove it and clear coat it again.

  • Normally I'd ignore it but the corrosion is pretty bad in certain areas, the clear has completely bubbled up and detached in places - look at the state of the rear brake bridge, so it needs protecting . Surprised this would be used as a factory finish as it's not proven durable ( Kona tech support told me it's normal patina that would be under opaque paint as well - pretty sure thats not true! A primer should protect the frame beneath a top coat )

  • Underneath normal paint this will still happen, just takes longer....

    Just get it powdercoated

  • Kona tech support told me it's normal patina that would be under opaque paint...

    Hmmm, if that’s the case then Kona are doing something wrong!

    A proper paint job should include some sort of corrosion inhibitor. Primer and paint should also be a lot less moisture permeable than clear lacquer.

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Rust under clear coat

Posted by Avatar for zootsuit @zootsuit