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I hadn't used them before though so didn't fancy my chances
At worst you'll have to stick in a tube anyway and you've tried them out.
If you can fix from the outside it means you keep the tyre seated, don't lose (as much) sealant, don't need to use a tube (which might flat further along anyway) and don't cover everything in jizz.
I really should've used my old Horizons to hack a big cut in and see how effective multiple anchovies and/or dynaplugs were - then I'd at least have experience without being out in the field (literally).
monkdagola
hippy
I've not done it but I've seen people use more than one plug for longer cuts.