I think we give too much credit to carbon paste for seatpost issues

Had a customer come in last week with a creaky seatpost on his carbon frame. He said he used a whole tube of carbon paste and it still slipped after a month. I cleaned it off, checked the torque with my Park Tool DCD-2, and found the real problem. The inside of the seat tube had a tiny bit of old, dried grease residue from the factory that the paste just couldn't stick to. A quick clean with isopropyl alcohol and a light re-application fixed it for good. Everyone just says 'use more paste' but sometimes that makes it worse by hiding the actual cause. It's not a magic fix, it's just one part of the job. Has anyone else had a seatpost issue that paste alone didn't solve?

3 comments

3 Comments

dianab682mo ago

Ever wonder how many creaks are just from a dirty seat tube? That grease residue story makes total sense... it's like trying to stick tape to a dusty surface. Good on you for digging deeper than just adding more paste.

fiona5022mo ago

Actually it's usually old grease that causes the issue, not dirt. The grease breaks down over time and turns into a sticky, waxy mess. That layer prevents the new paste from bonding to the metal properly. A thorough clean with degreaser is the real fix.

karenw906d ago

I saw a video from Hambini where he tested this on a frame under a microscope... the old grease was like a layer of plastic almost, totally smooth and waxy. He had to use brake cleaner three times before the metal actually looked dry again. That's probably why some people say they cleaned it but still get slipping... it looks clean to the eye but it's not chemically clean. The degreaser part is the key step everyone skips, I think.