Cleaning carbon paste off seatpost

by DefUnct   May 6, 2014  

Hi, i moved my seat post up quite a bit and the newly exposed section has some dried carbon paste on it which i used as per instructions during fitting. Most rubbed of with a damp cloth, but at the back of the post there is a stubborn dried section of it that won't wipe off. What would you recommend i use to remove it? Don't want to damage / scratch the carbon seat post. Thanks.

8 user comments

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brasso/duraglit wadding ....

still on the 3rd switch-back of Bwlch !

posted by therevokid [716 posts]
6th May 2014 - 13:31

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May not be residue, may be permanent (physical) scoring. Carbon paste is typically a gel with granules of something suspended in it. The granules will eventually mark the surface of the seat post to the extent that it is below the seat collar. (So if you swap a seat post between frames with different bb-seat post clamp measurements and you end up with more seat post exposed you can see where post used to sit within frame.) If this is the case, nothing will remove what appears to be dried carbon paste.

posted by surly_by_name [144 posts]
6th May 2014 - 13:41

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Thanks for the information. Any way i can tell if its permanent or not?
Presumably it doesn't harm the functionality of the seat post if it is permanent.

I've read quite a bit about getting the remains of adhesive / paste off carbon on the web today, some recommend white spirit, some methylated spirits - won't that damage the carbon?

posted by DefUnct [6 posts]
6th May 2014 - 16:28

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Won't come off = permanent.

Dunno, doesn't seem to have affected mine but a few years ago trek published an advisory notice to the effect that people shoudln't use carbon assembly past on carbon fibre steerer tubes (for stems - who would do this?) because scoring around circumference of steerer tube would result in stress risers which might cause steerer to snap. Don't know that this ever happened in real life.

Dunno, I am out of useful knowledge now. Good luck. Although if it's that hard to get off, why not just treat it as permanent. Is it all that disfiguring?

posted by surly_by_name [144 posts]
6th May 2014 - 16:56

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Try some degreaser, maybe?

posted by bashthebox [645 posts]
6th May 2014 - 17:11

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If you really want to know if it is pitted then look through a high power magniying glass. Alternatively take a photo of the seat post with you camera in macro mode; get as close as you can, with very good lighting (outside in daylight) and take a snap. Then zoom into the picture on your computer - you be amazed at the detail.

If the surface is very pitted then use T-Cut (for restoring paint on cars) to retore it. Be careful as this is a mild abrasive, so test on part of the post that is never going to show. You might want to try Duraglit wading (now called Brasso) as already suggested as this is a milder abrasive than T-Cut.

Good Luck

posted by wellcoordinated [81 posts]
6th May 2014 - 17:38

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Thanks a lot for the information and advice. It's not particularly bad, the only reason i asked is because it's a new seat post (few weeks old) so I'm in the mildly pedantic "want to keep it looking amazing" phase Smile

I'll have a go with the things you suggested and if it's permanent, then no problem, I'll just live with it and ride on.

posted by DefUnct [6 posts]
6th May 2014 - 19:18

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maybe a fizik silicone seat post collar? they are about 1cm long so might cover some of it

the carbon paste i used does warn on the tube it will cosmetically damage the post

posted by russyparkin [579 posts]
8th May 2014 - 19:57

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