Good to know. I prefer the satin finishes. I can't stand necks that have glossy finish on them. My backup bass has one, and it annoys me after playing it for a while.
Take a green scouring pad like the one you'd find in a kitchen and use it to sand the back of the neck. Start off slow and light and add pressure as needed. You don't want to take the finish off. You just want to knock the shine off. I did this on my MIM fretless J and it was way better afterward. Took about 5 minutes.