Just to throw my two cent's worth in here, it should be stated that with a plugged tire, you should not drive the car at speed. Freeway speeds are probably fine, but any speeds over 100 mph are going to heat the tire a lot while the plug and patch, due to their thickness and the difference in the material used to create them as well as the glue, remains cooler than the tire rubber.
You risk a high speed blowout by riding on patched tires. This is why most Porsche owners replace the tire when it is punctured. They like to drive fast.
My set of track rims has Sumi's on them and they're actually very good cheap budget tires. Nice and quiet and sticky in dry weather and rain from what I experienced.
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