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Take the valve core out, inject through the valve stem. Should be able to do it without a syringe- most sealant bottles have suitably shaped nozzles.
Pro tip - squish the tyre down - to expel air - then push the nozzle on then release the tyre and it will suck the sealant in to replace the air that came out.
Howard
hippy
Well it's staying up without sealant so I got further than I thought I would with tubeless :)
Should I look for a sealant I can inject through the valve? Does this method mess up the valve cores at all? Or should I pull it down and pour some sealant in? Is there a better sealant if using this method?