> If you just plug or tape the hole from outside, the water pressure
>> inside will push the plug or tape out. If it works, people would have
>> been selling it already. People can plug a puncture hole in a tire by
>> patching the hole with a piece of rubber and contact cement from INSIDE
>> the tire, but you cannot do that with a garden hose. Cutting the hose
> They can, but they don't. The shops around here insert a plug from the outside,
Those emergency tire plug kits are for you to plug the hole yourself on the roadside, so you can then drive to a qualified auto mechanic to patch the hole from the inside. Those plugs are not meant to be a permanent fix.
or they declare the tire unfixable and sell you a new one.
>
> The tire manufacturers say you must demount the tire and do both: insert the plug from the outside and add the patch inside. But none of the shops locally will demount a tire unless selling a new one.
My neighbourhood garage patched a nail hole in my tire last year for $25. That included demount, re-balance, and remount.