Used tyreweld to seal puncture, not sure who will be able to repair it

Hi everyone,

I had a flat tyre apparently caused by a slow puncture, so I looked for a tyre sealant and tyreweld marketed themselves as one of the only ones that leave the tyre repairable.

However, after further googling, it seems many/most garages refuse to repair even tyreweld-sealed tyres as it's still too hard to remove from the tyre.

Hence, I was wondering if anyone knows any garages that could repair my tyre - I'm in north London if that helps.

Also, I've read some people saying they've just left their Tyreweld in for the life of the tyre and it hasn't been a problem, but isn't that dangerous?

Thanks