yeah, make sure you buy inner tubes with removable valve cores for this, and then use leatherman pliers or a special valve core remover tool to add the sealant.
This makes a lot more sense as I didn’t see any removable valves on the standard Brompton inner tube...
I've tried the sealant in inner tube thing. With Stans and with not a lot of success. Maybe sealants have moved on a bit since.
brompton valves are removable.
@HoKe started
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yeah, make sure you buy inner tubes with removable valve cores for this, and then use leatherman pliers or a special valve core remover tool to add the sealant.