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Depending on the frame and finish on the post.....grease may be fine.
If the frame tolerance is on the loose side and?or the post has a glossy finish...it may cause it to slip.
Carbon paste will work better in this case.
Use something.....the post may get stuck otherwise.
 

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Use carbon grease specificly for carbon to any material. Richey sells carbon paste in little packets, tacx sells it, etc.
As said, any grease will do if there's no slippage. "Carbon grease" or "carbon prep" is grease with some grit mixed into it to keep a seat post from slipping. The reason carbon seat posts slip more than metal seat posts is because with carbon seat posts, you can tighten the clamp only up to a relatively mild clamping force.

The notion that "carbon paste" or "carbon prep" is needed because plain grease would interact with the carbon in some bad way is complete nonsense. But it does sell a lot of "carbon paste," so it serves a purpose. :)
 

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I've become a big fan of carbon paste, even when carbon isn't involved.

I have an aluminum stem/handlebar that tend to slip with plain grease, but ever since the use of carbon paste, no problem. I've even been using it with aluminum seatposts and steel frames lately.
That little extra bite allows me to go a little easier on the wrench.
 

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I have an aluminum stem/handlebar that tend to slip with plain grease, but ever since the use of carbon paste, no problem. I've even been using it with aluminum seatposts and steel frames lately.
That little extra bite allows me to go a little easier on the wrench.
And that is the ONLY reason to use carbon assembly paste - when things slip if you dont. I've used just grease with CF bars and posts with no issues.
 
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