Park Tool SAC-2 Supergrip Carbon and Alloy Assembly Compound Tool 4 oz/120 ml

Even fully torqued up to spec (and a little beyond), I had quite a bit of 'twist' from my saddle stem on my carbon framed bike... so I thought I'd try this. And holy crap, what a difference. Not much more to say other than it did the job like a boss. Word of advice though... don't use loads. There's really no need. This stuff would grip glass on ice. A little around the clamping area totally nails it. Any more than this and you'll be using arms, legs, feet and a whole other person to help should you ever need to separate stem from frame (been there... just sayin'... don't ask).

Quality product

I’ve had an ongoing problem with an aluminium seat post slipping in an aluminium frame. I’ve tried a couple of other carbon assembly pastes but they were too slippery. Together with a new clamp, this has fixed the problem. Very pleased.

Grippy paste used on seat tube, bar stem etc. of carbon framed bike. Avoids any need to over tighten the seat clamp with the associated risk of damaging the frame. You'll want to use this in conjunction with a torque wrench which, in any case, should be used when assembling lightweight bike components.

Perfect for mating carbon fibre surfaces to pretty much anything - I have used it for Handlebars and Seat posts on my mountain bikes and it grips really well without having to use excessive pressure on the clamps

Have used this carbon paste for many years but the last tube I got did not hold my seat post at all. Within 5 miles the seat post would slip down. Went to bike shop where they applied a competitors (cheaper but more gritty) paste and I’ve had no slippage since. Not sure if I just got a dud batch but it caused a couple of bike rides to be ruined.

Seems to be working very well I applied a few weeks ago and haven't had to adjust my seat post yet. Did exactly what I needed it to do and I still have plenty left!I haven't removed the seat post as yet so I cannot comment on any scratches or damage it may have caused. But to be honest it has worked and if there are some scratches its worthwhile.Use - carbon seat post into carbon frame. Fizik 00 seat post into Cervelo R3 frame

A great product. It saved me buying an alternative seat post clamp (as my alloy post was slipping down even on short rides). It most likely also prevented damage to my alloy frame by over tightening clamp. For personal use you will not need that much, but what it can save or prevent will far outweigh the cost or what you don’t use. Recommended.