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
Mr Hobby Gundam Marker Pouring Inking Pen Set 6 Color Set GMS122
Photo reference for Panel Lining HG Aerial rebuild & Schwarzette
Gundam Marker Pour Type for Panel Lines Set — GUNPLA SA
Paint Marker — Panda Hobby
What panel line color do you guys prefer? Black or Grey? : r/Gunpla
Mr.Hobby® Gundam Marker GM303 POUR TYPE FOR PANEL LINE (BROWN
How to Use Gundam Markers Like a Pro? - 5 Tricks
Shop Gundam Marker online
Buy PANELINER FOR GREY AND BLUE CAMOUFLAGE online for 3,75€
GUNDAM MARKER GM302 GRAY