Used the stuff. Didn't work.

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My Renovo R1 wooden bike project

Check it out: the most amazing vintage Colnago, Merckx and Pinarello collection

Works for me! I use carbon paste on all my seatposts (aluminium, carbon and ti). Never have any slippage. I also use it on all my bars and stems. Again no slippage.

I suspect that either your seatpost is slightly out of spec or most likely your frame.

The new aluminium No Name shim works fine, so I guess I can rule out wrong dimensions.

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My Renovo R1 wooden bike project

Check it out: the most amazing vintage Colnago, Merckx and Pinarello collection

Depends on the spec of the no-name?

Carbon paste is one of the better innovations in cycling and is essential not just for the WW but useful on any bike generaly allowing lower torque to be used to hold things firmly in place.
Manufacturers certainly see the benefit by recommending its use and supplying it with some frames and stems.

To say it doesn't work is plainly misleading. It didn't work for you due to either differing specs, tolerances or user error.

All set up and working well. Used FinishLine carbo grip inside and outside the shim.

Thanks to everyone who chimed in, much appreciated.

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Fear is healthy, panic can be deadly

Did the 27.2 to 31.6 shim weigh 25g (FWB) or 26g (manufacturer's web site)?

It actually weighed 20g. I thought about drilling it out a bit since it is not structural, but have not yet. I could probably get it down to 15g.

Very happy with the results.

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Fear is healthy, panic can be deadly