I've been really enjoying pretty much everything about my new Martin 000-15SM except for one thing: the satin finish. It looks and feels plasticky to me, and I just didn't like it. Ordinarily, I would have just lived with it, out of fear of messing up a not cheap, brand new guitar. It was already developing a smooth spot where my right arm rubs against the body, so I decided to go for it. I used Nu Finish and some clean cotton rags made from old tee-shirts. My goal was not a smooth high gloss, and I didn't mind the open pores in the grain being visible, which IMO makes it look more vintage and feels more like real wood. I gave the body and back of the neck about 5 applications of the Nu Finish, and then wiped it down a final time with a regular guitar polishing cloth. To get into the tight spaces around the bridge, I used a cotton swap. I am very pleased with the final result, which is a sort of eggshell or semi-gloss finish, with just enough gleam to look 'right.' My suggestion to anyone who attempts this is to do it in a space with natural light, so that you can see how consistently the finish is buffing out across the entire surface.