Here's the package featuring Mr. Joint set for Mr. Air hose by Mr. Hobby.
Install the gundam marker on the airbrush feeder.
connect the hose to the compressor.
Before using the Gundam marker with the airbrush system, make sure that the ink is properly squeezed out.
Align the marker like in the picture below.
Test if the Gundam marker's paint will distribute the paint properly on a plain plastic material before using it on the actual GunPla part. (e.g plastic spoon)