I'm sure you meant to say your like of flat finishes is in your opinion.

Putting a gloss finish on the guitar will most likely change the sound. Sanding it lightly with sandpaper of the very finest grit, then using a soft cloth to apply a coat of tung oil, will give it a nice look and dry to a hard finish. Two or three coats will give it added protection, as well, just be sure to let each coat dry thoroughly.