These pour type markers are oil-based paint pens that are similar in use and effect to panel line wash. You can use these on either straight builds or
PiXELATOY - Gundam Marker. GM-302 Grey
GSI Creos Gundam Marker Panel Liner (Pour Type)
How to Make Your Gunpla Models Stand Out with Panel Lining – LA
GSI Creos Gundam Marker Pouring Inking Pen Set
Markers & Panel Liners – Gundam Shoppers Network
Fine Model Gundam Marker, Hobby Lobby
This is one of the GUNDAM MARKER of mechanical pencil type which uses 0.3mm extremely thin lead. You can do inking easily by tracing hollow lines in the mold. Inking makes modulated realistic atmosphere without painting. You can use a rubber eraser for the excess paint. This pencil is the most suitable for beginners to do inking.
Bandai GP01 Gundam Marker Black Liner Mechanical Pencil .3mm
Panel Lining for Gunpla 101 - Gunpla 101
GMS122 Pour Type Markers Gundam Marker Set
Details: Upgraded colors come in GUNDAM MARKER series, called GUNDAM MARKER EX.It is enhanced its covering effect and colors really well. These are compatible with the Gundam Airbrush System.
Gundam Marker EX XGM02 Shine Silver