Do be careful. One time, I was making a a dozen arrows. I spined and weighed them, and marked those numbers on the shafts with a permanent marker. Then for some reason, I decided to put another coat of clear finish on the shafts before I fletched them. That caused the permanent marker to run, and I ended up with a mess. I covered up the mess with a broad cresting band, which looked odd, but better than the smeary writing. I still have one or two of them left, which are too ugly to die, I guess.