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jackbepablo
Sometimes punctures sealing is inconsistent.
Some big cuts may reopen and reseal. Those mushroom things I posted last week would help plug the gap from the inside.
Also if you have one of those difficult to seal cuts put some rubberised superglue into it. If the bike is stationary put the cut at the bottom so the sealant pools on top of it. It prevents pressure loss and helps keep a ready supply of sealant to help clog the hole.