I've also plugged many tires in the tread area with the brown or black "sticky string" and never had a problem. I worked at a Renault-Peugeot dealership '73-'76 and of course those cars came with Michelin X tires. We patched those from the inside with a tool that held a "patch assembly" tight to the inside. The patch assembly consisted of a metal cup with the patch part on the bottom and the inside of the "cup" filled with a flammable powder. You light up the powder which would burn for about a half minute and the patch would be permanently bonded to the tire. Then remove the tool and "cup" when it's cooled down. If you marked the tire/rim orientation there was no need to re-balance. -- Dave
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