I've used the sticky-string repair kit to repair a BMW i3-REx tire of which 2 of 3 efforts worked. Here is the first one:
My first plug patch. The 'needle' tool did not work but using a narrow, flat screw driver was able to push the sticky string in.
This hole was patched twice. The first attempt had a slow leak:
After reaming out the leaking plug, I reamed the hole aggressively and then squeezed the tire with a glob of adhesive at the hole. Releasing the hand pressure sucked the adhesive into the tire. Then the flat screw driver pushed in another sticky string perfectly.
Since then, a PriusChat member recommended this kit:
Pocket Tire Plugger for all Tubeless Tires
I have not plugged a tire with this kit but I am impressed with the approach. A flexible, mushroom shaped plug is forced into the tire where the flexible head expands on the inside. The stem is pulled and trimmed and air pressure forces the head against the inside of the tire. Best of all, there are no sticky strings nor adhesives.
I carry an automatic shutoff, tire inflator:
Once the tire pressure limit is set, the unit inflates the tire and shuts off when the pressure is reached. This lets me take the cap off of the next tire while the current one is inflating. Ending with tires more uniformly inflated.
Bob Wilson