Tubeless tires I understand.
I have had the best luck with the black or brown "gummy worm" type plugs that come in a plugging kit at almost any auto parts store. I like the kind labeled for belted radial tires because they are resistant to cutting if a tire has a steel belt. Get the kit with T handles if you can, and if you have room to carry them because they are easier to use than the kits with tools with screwdriver type handles.
I heard Paul describe this same stuff at one of his tech seminars at Sedalia (sitting in an air-conditioned building that was quite cool ). I still went and spent the bucks for the stop and go tire repair kit and a more expensive pump. Then I could kick myself when I see the parts Paul described at KMart, etc for just a few bucks and also a portable air pump for $10 that was going for 30-40 at the rally.
Pays to listen but it would have paid better if I would have waited and got the stuff at KMart.