How to Build Your First Gunpla

Gunpla kits look intimidating in the box — dozens of sprues, hundreds of tiny parts — but the actual building process is far more forgiving than it looks. Here's everything you need to know before your first build: what to buy, how the process actually goes, and the mistakes almost everyone makes the first time so you can skip them.

What you actually need

Not much. Gunpla kits are designed to snap together without glue or paint, and the plastic is already molded in the right colors — so a stock build needs exactly one tool:

• A side cutter (nipper) — a small, flush-cutting plastic cutter for removing parts from their sprue (the plastic frame they're molded on). A regular pair of scissors or a hobby knife will tear the plastic and leave a rough stub; a proper side cutter is inexpensive (most cost $8–15) and makes a genuinely large difference. Gunpla101 has a full rundown of essential tools for Gunpla building and their own tools ranked by value if you want to compare options before buying.

Everything below this is optional, worth adding only once you've finished a kit or two:

• A hobby knife — for cleaning up the small stub ("nub mark") a side cutter leaves behind.
• Sanding sticks / fine sandpaper (400–1000 grit) — to smooth nub marks further, mainly useful on visible outer armor pieces.
• A panel-lining pen or thin paint marker — traces the molded-in panel lines with a dark color to add depth and detail.
• Topcoat spray (matte or flat) — cuts down the factory-plastic shine for a more realistic finish.

Which kit should you start with?

An HG (High Grade, 1/144 scale) or EG (Entry Grade) kit is the right starting point — inexpensive, tool-light, and quick to finish. For the full comparison of every grade, see Gunpla Grades Explained. For specific kit recommendations, Gunpla101 maintains an updated list of the 20 best Gunpla kits for beginners (and their earlier best beginner Gunpla roundup) — genuinely useful if you want a specific box to point at rather than just "any HG."

The general build process

Nearly every Gunpla kit follows the same overall order, laid out in its included instruction manual:

1. Sort by sprue letter. Each sprue (plastic frame) is lettered, and the manual references parts as "A-1", "B-4", etc. You don't need to remove everything at once — most builders cut parts as each step calls for them.
2. Build in sub-assembly order. Manuals typically go legs → torso → arms → head → weapons/accessories, then final assembly. Each limb is usually its own fully-articulated unit before it gets attached to the body.
3. Cut, don't pull. Snip each part free from its sprue with the side cutter close to the part, leaving a small nub rather than pulling or twisting it off (which risks cracking or stress-whitening the plastic).
4. Clean up the nub mark. A small stub remains where the part was cut. For visible parts, a second close trim with the side cutter, or a light pass with a hobby knife or sanding stick, removes it. For parts that end up hidden inside the model, this step is optional. Gunpla101 has a dedicated guide on removing nub marks and avoiding stress marks if you want more detail than we cover here.
5. Test-fit before forcing. Gunpla joints are snug by design. If a part doesn't seat, double-check orientation against the manual rather than forcing it — polycap joints and small pegs are the most common casualties of force.
6. Final assembly and posing. Once all sub-assemblies are done, they connect at the shoulders/waist/hips per the manual's final diagram, and the kit is ready to pose and display.

Common first-build mistakes

• Cutting too close, then too far. Cut a bit away from the part on your first pass, then trim the remaining nub closer on a second pass — cutting flush in one go on a curved edge is how parts get nicked.
• Losing small parts. Polycaps, tiny joints, and accessory pegs are easy to lose to carpet or gravity. Working over a tray or shallow box catches drops before they vanish — and if it already happened, Gunpla101 has a guide on what to do when you lose a Gunpla part.
• Forcing a part that's misaligned. If something needs real force to seat, it's very often oriented wrong — rotate it 180° or check the manual again before pushing harder. If something does snap, Gunpla101's guide to fixing broken Gunpla covers the repair options.
• Skipping the manual's numbered order. It's tempting to jump ahead to the "cool" part (the head, a weapon), but skipping steps out of order is the most common cause of having to backtrack and disassemble something.
• Rushing. There's no clock running. A kit that "should" take two hours taking four is completely normal for a first build.

Realistic time expectations

An EG or HG kit typically takes 1–3 hours for a first build — closer to 3 if you're carefully cleaning up every nub mark. There's no need to finish in one sitting; most kits have natural stopping points between sub-assemblies (finish the legs, take a break, come back for the torso). Larger grades (MG, PG) take proportionally longer — see each kit's own page on GunplaDB for a grade-specific time estimate under "What to Expect Building This Kit."

What's next after your first build

Once you've finished a kit or two, the next steps that make the biggest visible difference are, roughly in order of effort: panel lining (tracing molded detail lines with a fine marker), a matte topcoat spray (kills the factory plastic shine), and simple weathering. None of these are required — plenty of builders happily stay at pure snap-fit forever, but if you want to go further, Gunpla101 has full walkthroughs for each:

• Panel Lining for Gunpla 101 — the basics of the technique, start here.
• How to apply a panel line wash — a specific, more advanced method.
• Top Coat Guide for Gunpla — matte vs. gloss vs. flat, and how to apply it evenly.
• Gunpla Weathering 101 — battle damage, dust, and grime effects once you're ready to go further.