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)

Gunpla tips: panel lining

HOW TO PANEL LINE YOUR GUNPLA

Panel Lining for Gunpla 101 - Gunpla 101

Tutorial: How to Panel Gundam Markers and TAMIYA Panel Line

Panel Lining for Gunpla 101 - Gunpla 101

Panel Lining Comparison: Sharpie Left, Gundam Marker Right : r/Gunpla

Panel Lining for Gunpla 101 - Gunpla 101

Gundam Meisters: Gunpla Tutorial: Panel Lining

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

HOW TO PANEL LINE YOUR GUNPLA

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

First time adding panel lines and other details : r/Gunpla

Layman's Gunpla Guide - Detailing Equipment