One of my guitars has some blemishes under the finish (I think it is nitro) on the headstock. Some spots where you can see the wood beneath. This would not normally be a big deal, but the headstock is black so the blemishes show up very easily. I thought it would be fairly easy to touch up once I get through the finish. What is the best way to accomplish this? I'd like to try and do it myself if possible. I'd even be up for something to use over the finish (if there is such a thing). Any thoughts?