• better options energy / pollution-wise

    Probably not, or people would already use them. The sort of short weak carbon fibres which work to clog holes in a tyre sealant can be made from biomass of various kinds, as the first carbon fibres were. Current efforts seem to centre around lignin, as vast amounts of waste lignin emerge from paper making.

  • There's nuts on the Panaracer sealant, or so they claimed. Not sure how that's good either. Some misterious fibrous thing that clogged valves in Stans Race, was actually pretty good.

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