How long does this last for, meaning does it need re-applying regularly?
(Carbon seatpost in carbon frame; does it need re-applying anytime I need to adjust seatpost height or if I remove seatpost when I deep clean bike?
It kind of sets so the gritty bits stay where they are, so adjusting your seat post shouldn't need a new application. Depends how deep the deep clean is, if you remove all the residue you might want a dab of fresh
Carbon-carbon is less of a problem than dissimilar materials that may corrode if they contact in the absence of grease
On that basis, try it and see
Hmmm, reason I ask is that I suspect carbon paste wasn't applied when the bike was built (not by me!) OR it's (somehow) got washed away on wet rides or when the bike got washed.
Anyway, the seatpost was a little stuck when I tried to do the deep clean and required a twist to loosen.
I've added some paste now but the seatpost is now scored 🤨
(Bike is only five months old. It's only been ridden twice in really filthy weather and, prior to yesterday, has only been given quick rinses with a low pressure hose so Im skeptical its washed away)
Carbon-carbon is less of a problem than dissimilar materials that may corrode if they contact in the absence of grease
The seat tube has some stupid steel (I think) wedge and shim as it doesn't use an external seat clamp...
No experience of those, so I'd keep it greased/pasted unless told differently.
Water and a bit of winter grot will hasten any corrosion
After having a fight with a frame a few years ago to get a dropper out I always remove them a couple or so times a year, clean and reapply carbon paste. It’s a 5 minute job and I don’t want to have the fight either the frame again
Truth is any time you move a carbon seatpost in a carbon frame, you really should re-apply carbon assembly paste. It’s not a lubricant in my experience, it’s a friction enhancer and the tiny grit in it does a few important things like stopping the post from slipping, reducing the risk of crushing the post and cutting down on creaks. Also helps prevent the post from bonding or seizing in the frame
So once you twist, adjust, or pull the post out that layer isn’t uniform anymore, and things like dust, sweat or water can weaken it. If you want proper protection and also to avoid a stuck post, it’s worth refreshing the paste whenever you move it.