I had a small nail in my tire a few weeks ago. i put a plug in it. It was fine for a few weeks but after I took it up over 100 it started slowly going flat again. So I redid the plug, but this time I took my time doing it. And I roughed up the hole a little better and used rubber cement this time too. It is fine now and I had it up well past 100 a few times. I think it should hold now for the remaining life of the tire. And anyway if it doesnt hold. I can feel the bike starting to handle differently so I can just pull over. Its not like the tire blows up or anything. I have lost a little confidance in my riding though taking the turns. But I'm due for a new tire in a few 1000 more miles. So that will be in like another month or two.
But Arturo3rd If your putting a inside patch on the tire you would have no problem ever. I know a lot of guys give crap to people who patch or plug the their tires. But how many of them actually saw a patch go bad. i bet none. They all just say that shit because they hear someone else saying it. I pluged a tire on my old bike and it lasted the through to the end of the tire. Almost 10,000 miles! I have a bad habbit of replacing my tires when the threads start showing! But that just goes to show you that a patch is fine for a tire and a plug is not the best but will do.
Thank God for Guardian Angels... Especially This One!