Improper Repairs: NHTSA (DOT)
“A plug by itself is not an acceptable repair.”
“The proper repair of a punctured tire requires a plug
for the hole and a patch for the area inside the tire
that surrounds the puncture hole.”
“Punctures through the tread can be repaired if they
are not too large, but punctures to the sidewall should
not be repaired.
Tires must be removed from the rim to be properly
inspected before being plugged and patched.”
NOTE: Michelin, Goodyear and Bridgestone say the same thing.
The use of sealant or Slime or "Fix-A-Flat" or similar is in some cases worse than using a plug. Not only can't the inside of the tire be inspected but the use of such product may void any tire warranty and make if difficult or impossible to make a proper repair.
Here are some pictures from one of my seminars on RV tires.
In the first picture you can see all the crack damage in the tire. These can lead to unexpected tire failure.
I hope that you can see how the use of external plug only or just a sealant, without an inspection of the inside of a tire could give you a false sense of security.
borintykiewicz
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