A CD in my collection had a millisecond drop-out in one spot. The label side Silver had been breached by a scratch and you could see daylight through it. I tried several methods, the toothpaste, the wax filler etc., to repair it because it wasn't inexpensive to replace. After some trial and error and long hard thinking I thought "I'll try some Black felt pen on the label side just to see if I can correct the millisecond skip. I can always remove it if it doesn't work." Well son-of-a gun it actually worked! Not cosmetically ideal and won't win any beauty pageants, but still worth it to me just to hear it properly. So if you have one with this condition don't hesitate to give this a try before tossing it in the trash.