Ashton Crusher wrote, on Wed, 09 Dec 2015 15:27:41 -0700:

I think a lot of these "proper ways" are fine but are often simply
driven by lawsuits.

Certainly millions of tires have been plugged from the outside.
I even saw plenty of videos on how to repair slashed sidewalls.

But, still, this is a repair and tech group.

We can fix things any way we want; but we should, at the very least,
*know* how to do it right.