G Project - Panel lining! An easy yet effective way to give your models that extra bit of flair. Here are some of the more common options: 1) Panel- lining Gundam Marker (スミいれ用)

Panel Lining for Gunpla 101 - Gunpla 101

If you are new to Gunpla then I suggest you use this pen for panel lining. It may be lazy but it works. : r/Gunpla

Panel Lining for Gunpla 101 - Gunpla 101

A Comprehensive Guide on Panel Lining - Make Your Gundam Kits Look Bet

Panel Lining for Gunpla 101 - Gunpla 101

Panel Lining for Gunpla 101 - Gunpla 101

How To Panel Line a Gundam Model Using a Gundam Marker Pen – Gundam Express Australia

Made my first attempt at very basic panel lining with a Gundam marker. Literally the 2nd and 3rd Gundam models I have ever put together. One left unmarked for now. : r/Gunpla

Bandai BANGNZGP01 GP01 Gundam Marker Liner Mechanical Pencil Type - Sharp 0.3 mm - Black

Gundam Meisters: Gunpla Tutorial: Panel Lining

Enhance your Gundam Builds with Gundam Marker Panel Lines!

The Gunpla Panel Lining: Gunpla's Guide to Markers and Paints

Made my first attempt at very basic panel lining with a Gundam marker. Literally the 2nd and 3rd Gundam models I have ever put together. One left unmarked for now. : r/Gunpla

The Gunpla Panel Lining: Gunpla's Guide to Markers and Paints