I've generally heard that the proper fix would be a plug and patch combination. It would be either a mushroom shaped patch or a separate plug and patch. I know Goodyear sells assorted kits and of course Rema is the biggest maker of these kits. Some of the kits I see come with industrial diamond coated or carbide reamer bits of different sizes to drill out the puncture area to a specific size to fit a specific plug.
My understanding about reaming out the puncture is to get a considerably better seal with a specific round plug (reduces chance of the belts rusting as well as leaks), and to remove loose strands of steel. A properly done patch prevents loss of air since the inner liner is what keeps a tire from leaking, and that's been compromised.
I personally have never found a place willing to do a plug only. The one time I did find a shop that would do a plug and patch, they refused to so it because it was too close to the sidewall. Another shop said they'd do it since I'd ordered tires there which would be installed in week.
Quote:
http://www.rma.org/wp-content/uploads/prp_wallchart1111.pdf
NEVER perform a tire repair without removing the tire from the rim/wheel assembly for internal inspection. (Do not perform an outside-in tire repair or on-the-wheel repair). It is essential that only a specially trained person remove any tire from the wheel when it has been damaged or is losing air. A thorough inspection for any internal damage can then be made. See WARNINGS.
NEVER use only a plug (stem) or never use only a patch to repair a puncture. The injury must be completely filled with a suitable vulcanizing material or rubber stem and a patch must be applied to the inner liner to prevent air loss.
Quote:
http://www.tirebusiness.com/article/2012...mplate=printart
Among the criteria the RMA recommends for a proper repair are:
* Repairs are limited to the tread area only;
* Puncture injury cannot be greater than 1/4-inch (6mm) in diameter;
* Repairs must be performed by removing the tire from the rim/wheel assembly to perform a complete inspection to assess all damage that may be present;
* Repairs cannot overlap; and
* A rubber stem, or plug, must be applied to fill the puncture injury and a patch must be applied to seal the inner liner. A common repair unit is a one-piece unit with a stem and patch portion. A plug by itself or a patch by itself is an unacceptable repair, the RMA said.