Nah, it won't harm the clear lacquer finishes on acoustics and some electrics, like yours, and especially won't harm the thicker typical electric finishes. It may leave a slight haze immediately afterwards, but a dry rag and/or additional polish will bring back the sheen.
As far as the string stuff, it supposedly is also a degreaser/protectant specifically for strings, marketed to lengthen the life of 'em. I've never used it myself though. It may work, I dunno...but the general occasional wipe down would be nearly as effective.
I think I remember also seeing some other kind of string applicant designed to make them slightly slicker for ease of play and unwanted noise reduction...but I've never used that either. :) Sorry. Again, it may or may not work, but prolly not necessary.