Short answer: Subassembly painting means painting a model in logical sub-groups before fully assembling it, then gluing the painted pieces together. You reach for it when a fully built model has surfaces the brush can't get to — behind a cloak, between rider and mount, in tight recesses. On complex models like these, it dramatically improves both access and paint quality.
The logic behind it is actually simple. Build a model fully and some surfaces become physically impossible to paint; but split everything into separate pieces and reassembly, plus hiding the seam lines, turns into a nightmare. Good subassembly sits right between those two extremes — you separate only what you need for access and pre-assemble the rest. In this guide I'll walk through when you need it, the steps, the common mistakes, and that fine balance in the middle.
What is it and what is it for?
Let's pin down the term first. Subassembly painting is painting a miniature while it's broken into sensible sub-groups instead of one solid piece. Once the painting is done, you glue the parts back together.
So what problem does it solve? A Knight, a bust, a mounted character, or a hero with a big cloak develops zones no brush (or even airbrush) can enter once it's fully built. Think inner surfaces, the back of a cape, the gap between torso and arm, the contact point between mount and rider. You paint those awkward zones separately, then join them. As a result, no corner is left bare and every transition stays clean.
A basic infantry model, by contrast, doesn't need this — splitting it just creates extra work. This technique is really for large, busy, deep models.
It sits at an intermediate-to-advanced level, and the real payoff is in paint quality. A surface you'd paint half-blind on a full build becomes easy to work on while the part is in your hand, so you can build up its shadows and highlights properly. That's why, the moment you first see a model, you should ask: "If I paint this in one piece, what stays hidden?" The answer is almost the entire subassembly decision.
How does it work?
At its core there's a single trade-off: the balance between access and ease of assembly. Build it fully and some surfaces can't be painted; over-split it and both the reassembly and fixing the joins (paint slop, glue marks) get harder. Correct subassembly holds the exact middle ground.
In practice, three principles make that happen:
- Keep access-blocking parts separate: things like mount and rider, a wide cloak, arms that detach at the shoulder, a backpack, large weapons, and the head.
- Pre-assemble parts that don't block access: that way the assembly and mold-line / seam cleanup are done right up front.
- Plan the join points ahead of time: choose splits where the parts will rejoin cleanly and the seam will be easy to touch up later.
Tyler Mengel of Mengel Miniatures sums up the golden balance like this: "Separate for access, assemble the rest." In other words, the more parts you can join before painting, the better — but never force together a piece that blocks a region you need to reach.
How do you do it, step by step?
Now let's walk through the core workflow for painting a complex model in subassemblies. The logic is straightforward: you paint each piece on its own with full access, then join everything and touch it up.
- Study the model: if it were fully built, which zones couldn't be painted? The back of the cloak, inner surfaces, tight recesses — make a mental note of them.
- Define the subassembly groups: keep the access-blocking parts (head, cloak, arms/shoulders, mount-rider, backpack, large weapons) separate. Pre-assemble whatever doesn't block access now.
- Mount or pin each part: fix every piece to its own handle for painting — a wine cork, a painting handle, a wire pin, or blu-tack all work.
- Prime and paint: prime the parts separately, then paint each one alone with full access. Important: leave the join surfaces (where the glue will go) bare and clean.
- Assemble: once the paint is dry, glue the painted parts together. Because the join surfaces are clean, the bond holds firm.
- Touch up: finally, fix the seam lines and any spots damaged during assembly. Don't skip this step — otherwise the joins stay visible.
A quick mnemonic for the order: separate, pin, prime, paint, assemble, touch up. One practical rule helps a lot — don't move to the next piece until the current one is fully finished, because three half-done parts confuse you far more than one completed one. Capping the join surfaces with blu-tack before you paint is also a handy way to keep those spots bare.
Which paints, brushes and tools?
The good news is that subassembly needs no special paint; the normal workflow is exactly the same. The difference is all on the holding and joining side.
- Handles: a wine cork, painting handle, wire pin, or blu-tack — so you can turn the part without ever touching the painted surface with your fingers.
- Glue: plastic cement on plastic, super glue (CA) on resin and metal. This distinction matters for a solid join.
- Hobby knife / file: to clean the join surfaces and remove mold lines.
- Touch-up brush: a fine-tipped brush to fix the seam lines. Here a wet palette keeps your paint workable and makes those touch-ups much easier.
- Wire + pin vise: for pinning. It helps both with holding the part while painting and with a strong join later.
The most common mistakes
Subassembly usually goes wrong for one reason: over-splitting. Steer clear of the traps below and the payoff is clear.
- Over-splitting: separate everything and you create needless assembly trouble and dozens of seam touch-ups. Split only what you need for access.
- Painting the join surface: glue then sticks to the paint instead of the part, so the bond stays weak. Leave those faces bare.
- Splitting without a plan: cut without an assembly plan and the parts won't rejoin cleanly.
- Skipping the touch-up: visible seam lines waste all that work. Always budget for the touch-up step.
Professional tips
A few small, right decisions turn subassembly from a chore into a clear win.
- Choose joins on natural lines: split at lines that already exist, like the shoulder, neck, or waist. That way the touch-up gets far easier.
- Pin it: a wire + hole combo gives you both a hold while painting and a strong join afterwards.
- Always split for the airbrush: subassembly massively eases access for airbrush basecoating and zenithal (top-down lighting) work.
- Paint the base separately: painting the figure and base apart gives cleaner results; for the details, see basing techniques.
- Pair it with an army: combined with batch painting, it speeds the whole workflow up considerably.
- When it's mandatory: on large, complex models — a Knight, a Daemon Primarch, a mounted character, a bust — subassembly is nearly mandatory; on simple infantry it's pointless.
One final balance note: subassembly is a tool, not a goal. Every time you cut a part, you create a seam-line debt that you'll later pay off with touch-ups. That's exactly why good painters work with the fewest meaningful parts possible — splitting a cloaked hero into torso + cloak + head (three pieces), say, rather than four. Splitting little but well is always cleaner than splitting a lot but messily.
Frequently Asked Questions
Does every model need subassembly painting?
No. A simple infantry model is painted in one piece; splitting it just makes extra work. Subassembly is for large, deep, crowded models: cloaked heroes, mounted characters, busts, and giant kits like a Knight. The rule of thumb is one sentence: if the brush can't reach it, separate it.
Why must I leave the join surfaces unpainted?
Because if the glue bonds to paint instead of the bare part, the join stays weak and the piece falls off later. Leave the join faces clean so the adhesive grips the plastic or resin directly. And if you mark those spots before painting, you won't slop paint onto them by accident.
How should I hold the parts while painting?
A wine cork, painting handle, blu-tack, or wire pin all do the job. The goal is to turn the part freely without touching the painted surface. Pinning also adds a nice bonus: the same wire hole is reused for a strong join later on.
Does subassembly speed painting up or slow it down?
Honestly, both. On one hand the painting itself speeds up, because every surface is reachable. On the other, assembly and touch-up add time. The net win only shows up on complex models; on a simple figure, the extra assembly outweighs the gain.
How do I hide the seam lines?
There are two ways. First, choose your joins on natural lines like the shoulder, neck, or waist from the very start. Second, always touch up after assembly. You close the seam with a fine brush and paint kept workable on a wet palette; if needed, you soften the transition with a tiny glaze (a thin transparent layer).
Should I prime the parts separately?
Yes. Separate priming lets you reach every surface — because the zones that stay blind on a full build won't even take primer. So mount the parts on their handles and prime each one, then move on to paint. This is one of subassembly's biggest advantages.
Which glue should I use?
On plastic kits, plastic cement is the strongest option because it welds the parts by melting them; on resin and metal, super glue (CA) is the choice. Either way, apply the glue to the bare join surface. On large, heavy parts, pair CA with pinning — because glue alone may not carry a massive arm.
Takeaway: subassembly fits in one line — separate for access, assemble the rest. Done right, no corner is left bare and the seam lines vanish. To round out your kit, browse our paints, brushes & hobby supplies.