Being the clumsy, graceless sod that I am, I've had the misfortune of seeing my beloved MIA p-bass accidentally collide with the amp, ceiling, drummer, etc on a few occasions. The problem is, some of the varnish has broken off, leaving wood exposed. There are three places where this has happened (don't ask...) - the back of the headstock, the very top of the fretboard, and on the bottom of the body, near the button for the strap. My question is, how can I replace this finish? Should i just varnish over these places? Is there any particular varnish I should use, or any that I should avoid? Any advice is appreciated. Thanks in advance for any replies.