Re: Is Finger Ease bad for your guitar?
Any additives are superfluous. Just clean yoiu strings with a soft rag after finishing playing.
Once a year, after cleaning the fretboard, use a little bit of lindseed oil or lemon oil.
That's it.
And never, ever use any compound that has silicone in it.
Follow those simple rules and you'll be playing you axe for at least 50+ years.
HTH,