In future, just whack in new sealant through the valve if you can and keep the tyre beads seated.
The Stans injector is probably one of the most overpriced but still useful TL things I've bought. Much easier and cleaner than just tipping sealant in and out of tyres.
You bought that syringe thing? Everyone else just uses a refilled small (60 ml) Stans bottle, which is about £3.
@hippy started
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In future, just whack in new sealant through the valve if you can and keep the tyre beads seated.