I have an Ibanez TR bass -- not an heirloom, but a good player. Last night, some stuff fell from a shelf in my basement, in particular a sanding block with 220 grit sandpaper on it bounced off the back of my bass, leaving a scuff mark. The finish is a dark metallic blue. Any ideas on how to fix this, or should I leave well enough alone? Even a partial repair to make the damage less conspicuous would be welcome. This is a good lesson for putting my bass in its case when I am not playing it.