to those who make guitars, dulcimers, whatnot,...is it best to NOT apply any finish to inside of instrument? To leave wood bare? Will a finish affect the tone in any way.
And for those who make, e.g. recorders or flutes, do you treat / waterproof the insides in any way,...or again bare wood?
And for those who make, e.g. recorders or flutes, do you treat / waterproof the insides in any way,...or again bare wood?