According to Tech, one of the big tire repair supply manufactures, these repairs are just fine, if done properly. I just checked to see if they changed their position, and they haven't.
Years back I was at a meeting in Ohio where a Tech rep talked about proper repair. He brought a Uniroyal radial with him that they had put 19 holes in the sidewalls. After the repairs were made they ran this tire for something like 30,000 miles on a GM test track. Not one repair failed.
He pointed out that this was only safe on radial tires, although many myths abounded at the time about radial tires.
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