Plugging is permanent; if done correctly and the puncture is a candidate for a plug. Meaning that the puncture is in the travelled tread area of the tire. If the puncture is located on the sides of the tread area, then the plug may not seal permanently.
I've plugged quite a few motorcycle tires and never have had a plug fail. However, I have never plugged a front M/C tire. All have been rears.
Go to Walmart and pick up a Slime plug kit for like $10.00 and do it. There are others on this forum that have plugged their tires with no issues as well.
1. Remove the nail and observe the penetration angle as you remove it.
2. Ream the hole at the same angle with the reamer to clean it.
3. Plug the hole at the same angle with the fibrous plug, and make sure you cut off the excess with a razor blade.