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We weren’t 100% certain what it was, but because of the awkward shape right up at the end of the seatpost there, it’s probably a plug of consolidator to make sure the bag had something smooth to press against without getting popped or stuck in the end.
I don’t think the thickness of the carbon is so much of a concern. The worst bit is round the clamp area. Those dark grey slightly bubbly looking areas are not carbon, they’re patches of a shoot-in expanding filler that used to be used in the ends of moulds where consolidation was difficult (back in the day before bagging techniques improved).
Is the white stuff just resin?
The carbon looked real thin here: