A great build can look flat until the panel lines show up. Learning how to panel line Gunpla is one of the fastest ways to give an HG, RG, MG, or SD kit more depth, contrast, and that clean mechanical anime finish. The trick is not flooding every groove with ink. It is choosing the right liner for the plastic, working in small sections, and cleaning the excess before it becomes a problem.
Panel lining is beginner-friendly, but it rewards patience. A sharp black line can make armor vents, knee plates, and head details pop. Too much ink, the wrong solvent, or an aggressive cleanup can leave stains, stress marks, or even damaged parts. Build smart, fellow collectors.
What Panel Lining Actually Does
Panel lining adds a dark color into recessed grooves molded into Gunpla armor. Those grooves represent separations between plates, mechanical details, vents, and joints. The added contrast makes the sculpt easier to read from a shelf away and gives the kit a more finished look without requiring a full paint job.
Not every line needs to be black. Black delivers the highest contrast and works especially well on white, gray, and light-colored armor. Dark gray is often more natural on white parts when you want a less graphic look. Brown can look excellent on warm colors like red, yellow, and tan, while gray can disappear nicely into darker blue or black armor.
The best color depends on the kit and the style you want. A clean anime build might use restrained gray lines. A battle-worn or high-detail build can handle deeper black contrast. There is no single “correct” finish in Gunpla. Your shelf, your faction, your rules.
Choose Your Panel Lining Tool First
Before putting ink on a part, identify the plastic and decide how much control you want. Most builders start with Gundam markers because they are simple, accessible, and easy to correct. Panel line washes create finer results but require more caution.
Your basic panel lining setup should include:
- A fine-tip panel line marker or a pour-type panel line marker
- Cotton swabs and a soft cloth or paper towel
- Isopropyl alcohol for marker cleanup, used sparingly
- A hobby knife or sanding tool for cleaning rough panel lines before inking
- Optional paint markers, enamel wash, and a gloss topcoat for advanced work
Pour-type markers and panel line washes use capillary action. Touch the tip or brush to one point in a recessed line and the ink travels along the channel. This creates crisp results quickly, especially on modern Bandai kits with sharp molding. It also means you need to use less product than you think.
Know the Plastic Before Using a Wash
This is where a little hobby knowledge saves a lot of heartbreak. Many Gunpla armor pieces are polystyrene, often marked PS, and generally work well with appropriate panel line products. Some joints and inner-frame pieces are ABS, which can be more vulnerable to strong solvents.
Enamel-based panel line washes can make bare plastic brittle if applied too heavily, allowed to pool, or used on assembled parts where the solvent can seep into seams. The risk is higher around thin pieces, pegs, joints, and ABS components. If you use an enamel wash, apply it to separate parts in tiny amounts, let it dry fully, and test it on a runner or hidden area first.
For a first build, a water-based or Gundam marker approach is the low-stress route. A crisp HG is better than a broken HG.
How to Panel Line Gunpla Step by Step
Panel line before final assembly whenever possible. Separate parts are easier to hold, easier to clean, and safer to work on than a completed kit with ink trapped in every seam. You can still line an assembled model later, but use a lighter touch around joints and tight armor gaps.
1. Clean Up the Groove
Remove nub marks and check the panel line itself. If a nub gate crosses a groove, carefully restore the channel with the back of a hobby knife or a dedicated scribing tool. Do not cut deeply just to make a line darker. The goal is to remove obstruction, not carve a canyon into the armor.
Dust and sanding residue can interrupt ink flow, so wipe the part clean before lining. This small step matters most on light armor, where stray pigment is easier to spot.
2. Apply Less Ink Than You Expect
With a fine-tip marker, draw inside the recessed line with a gentle hand. Do not press hard. Let the marker touch the groove and move slowly.
With a pour-type marker or wash, touch the line at a junction, corner, or one end. Watch the pigment travel. If it stops before reaching the next section, add one more tiny touch. Do not drag a flooded tip across the entire piece. Controlled applications give you clean channels and far less cleanup.
Work one armor plate at a time. A Gundam face, shield, or backpack may look like a tiny project, but treating it as a series of small surfaces keeps the process manageable.
3. Let It Set, Then Clean the Excess
Wait until the ink is no longer wet but has not fully hardened into a stubborn stain. Timing varies by product, room temperature, and how much you applied, so test your liner on a spare runner first.
For standard marker ink, a dry cotton swab or soft cloth may lift the excess. If needed, lightly dampen the swab with isopropyl alcohol and wipe across the panel line, not along it. Wiping across removes surface ink while leaving pigment in the recess.
Use very little alcohol. A soaked swab can spread pigment across matte plastic or disturb paint if you painted the part. Rotate to a clean side of the swab often. If the swab is already black, it is more likely to smear than clean.
For enamel wash, use the compatible enamel thinner only with care, and avoid letting thinner sit on bare plastic. Many advanced builders place a gloss clear coat under enamel panel lining because the smooth barrier makes cleanup easier and provides additional protection. That is a useful upgrade for painted kits, but it is not mandatory for every straight-build Gunpla.
4. Check the Part Under Good Light
The line that looked perfect at your desk can reveal a smudge under a brighter lamp. Turn the part in your hand and check raised edges, corners, and textured areas. Clean any stray ink now, before assembling the kit.
If a line looks weak, add another small application after the first pass is dry. Building color gradually is cleaner than trying to fix a heavy flood.
Where to Panel Line and Where to Hold Back
Focus on recessed details that already exist in the molding: armor separations, vents, hatch outlines, head camera borders, shield details, and mechanical layers. These are the areas designed to accept a panel line.
Hold back on shallow grooves that are barely visible, especially on dark armor. A black line in every tiny crease can make a kit look dirty instead of detailed. On an HG, selective panel lining often looks better than treating every surface like a real-grade technical drawing.
Be extra careful around moving joints. Ink and solvent can travel into seams through capillary action, then sit near pegs or inner-frame parts. Line those areas before assembly when possible, and keep applications minimal.
Common Panel Lining Problems and Fast Fixes
If your ink will not flow through a groove, the channel may be too shallow, blocked by sanding dust, or interrupted by a nub mark. Clean the area and use a fine-tip marker instead of forcing more wash into it.
If you get a halo or stain around the line, stop adding product. Use a barely damp cleanup tool and work from the outside of the stain toward the groove. Repeated hard scrubbing can make the finish uneven, particularly on softer plastic.
If the panel line looks too dark, switch to gray or brown on the next section. You can also use a lighter touch and clean more thoroughly. High contrast is a style choice, not a requirement.
If you are panel lining a painted kit, protect your work with a clear coat that is compatible with your liner and cleanup method. Test every product combination on a spoon, runner, or spare part. Paint, clear coats, washes, and thinners all behave differently, and a five-minute test is cheaper than repainting a shield.
Finish the Build Your Way
After the lines are dry and clean, assemble the kit and decide whether it needs more. Waterslide decals, stickers, metallic details, and a final topcoat can all push the finish further, but none are required for a satisfying build. A neatly built HG with selective panel lining has serious shelf presence.
WELCOME TO UTOPIA means finding the version of the hobby that fits you. Start with one white armor plate, one controlled line, and one cleanup pass. By the time your next Gunpla hits the display, those small details will make the whole mobile suit feel ready to launch.