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  1. #1
    Senior Member Mojo GoGo's Avatar
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    Silicone OK with carbon?

    Just wondering if there are any issues with using silicone caulk on carbon (e.g., competing view of lube on carbon seat posts). My frame gathers quite a bit of water when riding on wet roads/in the rain and I'm thinking about applying a thin bead of caulk around the seat post.
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  2. #2
    Senior Member capwater's Avatar
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    That's just wrong, though it probably wouldn't hurt anything. You shouldn't be getting water in between the post and the seat tube. If you must, just wrap a layer of clack electrical tape around. The only silicone on a carbon frame should be Lynn Gaggioli.

  3. #3
    Senior Member Mojo GoGo's Avatar
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    Quote Originally Posted by capwater View Post
    That's just wrong, though it probably wouldn't hurt anything. You shouldn't be getting water in between the post and the seat tube. If you must, just wrap a layer of clack electrical tape around. The only silicone on a carbon frame should be Lynn Gaggioli.
    I don't disagree but if I'm out in the rain I have to tip my bike upside down and about a 1/4 cup of water will drain out. I already have the electrical tape on the tube to mark seat height but it doesn't help - I think the water is coming in just below the clamp where the seat post tube is slotted vertically.

    I was just hoping to verify if there was anything in the silicone that would chemically damage the carbon or any materials to stay away from (e.g., petroleum based).
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  4. #4
    Senior Member ericm979's Avatar
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    Since a lot of greases will attack carbon fiber, I'd be concerned about using silicone sealer.
    Can't you just put a piece of electrical tape over the seatpost slot?

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