I don't think there is a way. Are you painting one of those toothpick beam sabers?
I had been in the habit of painting them with a custom mix of pink or green (whatever color it's supposed to be) usually I'll paint it a little darker at the base by the handle, make it lighter in the middle, and then darker at the tip. Hope that helps... unless you're not painting beam sabers
Until Next Time: Happy Building!
Want to Buy LM Leo or Taurus from Gundam Wing, built or unbuilt! Willing to pay big!