I've used Holt TyreWeld in the past and the tyre depot were able to wash it out and repair the hole without any problems. I Got a puncture in a rear tyre (Goodyear Billboard) in the way to Le Man a few years ago and the TyreWeld sorted it out. I was an,e to continue the journey, do some steady track laps and drive all the way home again. I got it fixed properly when I hit home.