| You can/should treat the rosewood with the oil of your choice (lemon, orange, etc), just don't over so it. The rest of the neck is fine, if you like satin (I do). If you are determined to thicken it up, there are some wipe-on poly products that are fairly easy to apply and are available at local Home Depot/Loews. However, I would suggest doing some more research before just slapping it on there. Althought not difficult, there is a little more to it than that. | 
