I have 3 fiddles that have been in my family for at least 3 generations, mostly dating to the 19th century but not from highly desirable makers (one is a fake 'strad' dated to 1747). I play traditional Irish music. Not one of them could be reliably tuned with the pegs alone and 30 years ago I put fine tuners on all strings as the pegs were either so tight that I feared they would break, or else just lost grip altogether. This stuff is wonderful. Extremely easy to apply, slightly soft, run in it for a couple of revolutions and string back up. All of my fiddles can now be easily tuned with the pegs. Nearly cried with happiness.