I work for a company that exclusively does Michelin tires... Here is
their Page.
But, I'll put the important parts in quotes.
Quote:
Originally Posted by Michelin Tire:
The proper way to have a tire repaired is to patch the tire from the inside and fill the puncture hole. Do not have your tire plugged. Ever. Plug repairs do not involve taking the tire off the wheel for a proper inspection. A plug is simply inserted into the punctured area, making it unreliable. Insist on a full inspection and have your dealer demount and internally as well as externally inspect the tire, patch and fill the repair on the inside of the tire.
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This is how I learned to repair tires, my shop doesn't even stock/sell/allow us to use plugs for this reason.