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)
Learning flow type panel line markers will bread the plastic on Robot Spirits Eva the hard way : r/Gunpla
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A Comprehensive Guide on Panel Lining - Make Your Gundam Kits Look Bet
How To Panel Line a Gundam Model Using a Gundam Marker Pen – Gundam Express Australia
HOW TO PANEL LINE GUNDAMS: THE LAZY ARSE WAY! - PANEL LINING TUTORIAL
HG Aerial and my first time with panel lining. Probably not the best kit to be trying it for the first time. : r/Gunpla
Easy to Use, it's just like using a pen when using it to scratch / mark surfaces. Easy to control and makes smooth & clear permeation. Perfect tool
ANSAI Permeation Pen Panel Line Hobby Military Model Modeler Painting Tools
The Gunpla Panel Lining: Gunpla's Guide to Markers and Paints