Panel Lining Almost Made Me Quit Gunpla. Here's What I Was Doing Wrong.

By KitReviewerApr 23, 2026⏱ 7 min read💬 52 comments0

Forget every complicated tutorial you've seen. Here's the honest truth about panel lining — and more importantly, the three mistakes that made my first attempts look genuinely embarrassing.

Mistake #1: Using Black on Everything

Gray runners? Gray liner is your friend. White runners? Go brown or gray — never black. I cannot stress this enough. Black lines on white plastic doesn't look "detailed", it looks like someone drew on your kit with a Sharpie. The goal is subtle depth, not visible war wounds.

A good rule: match the liner color to a slightly darker version of the panel surface. Gray on white. Dark gray on light gray. Brown on tan or beige. Black only on very dark surfaces or exposed mechanical frames.

Mistake #2: Skipping the Top Coat

If you're doing any kind of finishing — decals, painting, anything — hit the kit with a flat top coat before panel lining. The enamel thinner you'll use to clean up mistakes can eat into bare plastic if you're unlucky. A coat of Tamiya Flat Base acts as a protective layer AND gives the liner something to bite into, which means cleaner, sharper lines.

I skipped this step on my second HG Zaku. I don't talk about that kit anymore.

Mistake #3: Too Much Thinner on the Swab

Apply the liner. Wait 10-15 minutes. Then clean up with a cotton swab that is barely damp with enamel thinner. The keyword is barely. You're not cleaning a kitchen counter. One small drop on the tip, dab it on a tissue to remove excess, then clean. If your swab leaves a shiny wet trail, it's too wet.

Over-wet cleanup dissolves the liner from inside the recesses too, which defeats the entire purpose. Patience here pays off massively.

Start With HG, Always

HG kits are perfect for learning panel lining. Fewer lines, lower stakes, cheaper to replace if you mess up. Build an HG Zaku or an HG Aerial and go to town on it. Once it clicks, you'll never want to build without it.

The moment a kit transforms from "okay" to "damn" just from some ink in the recesses — that's the feeling that keeps you in this hobby forever.

The Ultimate Panel Lining Confession

The single biggest mistake new builders make: trying to panel-line their first kit immediately. Don't. Build the kit. Take a photo. Then practice panel lining on a cheap HG kit you don't care about. Then come back to your first kit later.

Panel lining is a skill. It takes 5-10 attempts before it clicks. Save your favorite kits for when the technique is solid.

The Tools That Actually Matter

Three things: Gundam Marker (gray for HGs, black for MGs/PGs), a sanding sponge, and patience. Premium tools (god-hand nippers, professional sanding sticks, color paint sets) help but are unnecessary for first builds.

The single most expensive thing worth buying early: god-hand nippers. ¥3,500. They reduce nub cleanup time by 80% on every kit you ever build. Worth it.

The Order of Operations

Build → top coat → panel line → decals → final top coat. This sequence prevents the most common rookie mistakes — silvering decals (skipped first top coat) and panel liner pooling (built without surface prep).

What Pros Don't Tell You

Most magazine-quality kits are repainted and weathered. The factory plastic finish, even when perfect, isn't what you see in published photos. The 'clean OOB' look is usually just a starter point.

This isn't a discouragement. It's clarification. Your kit doesn't need to look like the magazine; it needs to look like YOUR kit, finished how YOU want.

The Kit Sequence

Build cheap first. Build expensive later. The order is critical: HG → RG → MG → PG. Each step up assumes baseline skills from the previous tier.

Skipping ahead (jumping from HG to PG) leads to expensive frustration and sometimes broken kits.

The Single Best Advice

Build something. Don't research forever. Don't watch tutorials forever. Don't shop for tools forever. Buy a cheap HG kit, follow the manual, snap it together, put it on the shelf. Then build another one.

The hobby compounds quickly. Three kits in, you'll wonder how you ever found it intimidating.