If a Glow Board, Glow Dome or Glow Book Marker seems dry after remaining uncapped, try rubbing it back and forth on the drawing surface several times. If the marker still doesn't work, replace the cap for 2 - 3 hours and then try using it again. If unsuccessful, you can dip the tip in warm water for about 5 seconds. After recapping the marker, wait 24 hours before attempting to use the marker again.