Gently wash the surface subject to coating in order to remove grease, soap, oil remains, etc. Leave it to dry. Shake the unopened marker for 30 seconds. Remove the cover and gently press the marker tip onto the paper until color appears.
Be patient, all marker fibers must be soaked in color.
The marker tip is replaceable. Rough joints can damage (wear) the marker tip a bit. You should simply take it out, turn upside down and place it back in the marker. The coat is dry when you touch it after 2 minutes. One marker can cover around 50 meters of 5mm wide joints.