 Yes they can be repaired if...
...the puncture is relatively small (generally 2mm maximum) and,
If it is toward the middle (central) 6 inches of the tread patch. It cannot be a severely angled puncture... it should be at less than a 30% 'slant', and in any case the 'travel' of that 'slant' cannot encroach on the tire's sidewall, or even be within an inch or so of the sidewall.
The proper fix is the vulcanized plug/patch... a combination fix that is basically chemically and heat fused -into the puncture- and -onto the inside of the tire carcass- on top of the puncture to absolutely seal it. They hold beautifully and do not compromise the tire in the least.
I speak from direct experience... three repairs - holding without consequence. The tires ride as new and I assure you that such a repair holds under extreme circumstances.
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