Reply To: to clean or not to clean (laps) › Forums › Beginner Questions › to clean or not to clean (laps) › Reply To: to clean or not to clean (laps) May 19, 2017 at 1:22 pm #3244 Alan BalmerKeymaster @alanbalmer The 320 Nubond will be very slow for taking off a lot of material, but it will leave a pretty smooth surface, probably only about 0.1mm damage layer.