Prepare and shake: The parts to be colored must be dry, dust-free, and free of grease. Shake the pen vigorously for 10-20 seconds with audible mixing balls. Remove the cap - the tip must be pointing upwards. Venting: Pressure can build up in the pen. To prevent splattering, pressure equalization must be carried out: Remove the pen cap, hold the pen with the tip facing up (preferably over a cloth). Pressing "PRESS" will vent the pen. Activation: Hold the pen with the tip down to activate. Gently press "PRESS" to slowly fill the tip with paint. If necessary, wipe off excess paint on a cloth. Application: Apply the color evenly in one stroke. If the coverage diminishes, let more paint flow by pressing "PRESS" again. Close the pen immediately after use.