Short answer: Edge highlighting is the technique of running a very thin line of lighter paint along a model's hard edges and sharp corners so those edges stand out. You use it on hard surfaces like armour plates, weapons and mechanical parts, not on soft surfaces like skin or cloth. In short, it mimics the way light catches sharp edges in the real world.
This is actually the signature technique of Games Workshop's 'Eavy Metal studio, and it is one of the most visible differences between a "tabletop" and a "tabletop-plus" paint job. That is because even a single thin line sharpens the form and gives the sculpt a crisp, readable look. The logic is purely optical: in real life a sharp corner catches the light and glows, so you recreate that glow with paint.
What is edge highlighting and what is it for?
At its core, edge highlighting means placing a lighter version of the base colour (or a neutral grey, white, or a warm yellowish highlight) only on the very top ridge of an edge. The goal here is to help the eye read the sculpt clearly.
Goonhammer puts it like this: we apply a thin highlight line to a model's raised and hard edges so those edges stand out. As a result, the armour looks like metal and the weapon looks sharp.
That is why the technique works best on armour, mechanical parts, weapons and hard surfaces, and why it has become the bread-and-butter technique for anyone painting Space Marines, robots and vehicles. In terms of difficulty it sits between beginner and intermediate: you grasp the logic in minutes, but landing a clean line takes muscle memory.
How does it work?
It all rests on one simple observation: when light hits an object, it reflects most strongly off the sharp edges. Edge highlight simply simulates this, so you put a thin light line exactly where that glow would naturally fall, along the top ridge of the edge.
This little trick fools the eye. The brain reads that thin line as "light is hitting here," and the form suddenly gains depth. So a flat coat of paint starts to look like a three-dimensional volume.
The effect is strongest when shadow and highlight sit side by side. Once a dark shadow has been laid under an edge, it meets the thin light line above and the contrast peaks, making the plate seem to leap forward.
There is one important limit, though: soft, organic surfaces (skin, cloth, fur) do not produce sharp glints in reality. That is why edge highlight looks fake there; instead you use Layering and smooth transitions.
How do you do it step by step?
Before you start, pick a single light direction and stay loyal to it; most painters assume light coming from above. Once that is settled, here is the recipe for a clean edge line:
- Prepare the brush: Choose a small brush that holds a good point (size 0–1). Thin the paint to a medium-thin consistency; too watery and the line spreads, too thick and it goes chunky and streaky.
- Load the brush: Take very little paint and wipe the excess off on the palette edge. The brush should carry "little but controlled" paint.
- Sweep the edge: Drag the side of the brush, not the tip, lightly along the ridge of the edge; "scrape" the edge like a knife. A single, steady, fast stroke gives the cleanest line.
- Hit the corners: The corner points where two edges meet should be the brightest spots, so add a touch of extra highlight there.
- Layer it up: For an advanced look, do two stages; first a mid-light tone on the broad edge, then a lighter or white tone only on the very tip. This "highlight within a highlight" doubles the sense of sharpness.
Wondering about the order? Think of it this way: edge highlight comes near the very end, after Basecoating and Washing, Shading and Pin Wash.
Which paints and brushes do you need?
For this technique the brush tip is everything; a blunted brush will never give a clean line. Beyond that, the materials list is short:
- A Kolinsky sable brush with a good point, or a quality synthetic detail brush (brands like Citadel, Army Painter and Artis Opus all offer suitable options).
- As the highlight colour, a lighter version of the base colour; on top of that, a neutral grey, white, or a yellowish tone for warm light.
- A little water or medium to thin the paint (Citadel, Vallejo, Scale75, Kimera) to medium-thin.
- A wet palette to keep the consistency stable for longer.
If you are unsure about how much to thin, the Thinning Paint: Two Thin Coats principle applies here too; several thin passes always beat one thick one.
The most common mistakes
Edge highlighting is easy to grasp but takes practice to perfect. The good news is that most beginner errors come down to one sentence: the line is too thick. Here is what to avoid:
- Making the line too thick: It spills below the edge and looks like a "thick stripe" instead of a painted edge, so keep it thin.
- Not thinning the paint: This leads to a ragged, uncontrolled, streaky line.
- Applying it everywhere: Edge highlight looks fake on soft, organic surfaces, so only put it on hard edges.
- Inconsistent light direction: Highlighting some edges on top and others on the bottom confuses the eye. Set one light direction from the start.
- A shaky hand: Holding your breath and pulling the stroke in one go greatly reduces the wobble.
Professional tips
Speed and cleanliness really come from muscle memory. Even so, a few small habits can seriously shorten the learning curve:
- Use a painting handle to steady the model and rest your hand on your wrist; this cuts the shake dramatically.
- "Less paint, more control": the less paint on the brush, the thinner the line.
- Do not panic over a mistake; cover it with the base colour and try again. Edge highlight is a forgiving technique.
- You will pull the line slowly at first, and that is normal; as you repeat the same edge dozens of times the motion becomes automatic and you speed up a lot.
According to Vince Venturella, the secret to control in edge highlighting is the amount of paint on the brush: the less you carry, the thinner and cleaner the line. His "Hobby Cheating" edge highlighting videos are the standard reference on the subject.
Frequently Asked Questions
In what order should I do edge highlighting?
Near the very end. First comes Basecoating, then Washing, Shading and Pin Wash for shadows, then your main colour highlights. Because edge highlight is the final touch that sharpens the form, it goes on top of all of that, at the end of the job.
What brush size should I use?
A small brush that holds a good point, usually a size 0 or 1. In fact, the sharpness of the tip matters far more than the brush size. A large, blunted brush will not give a clean line; a small Kolinsky sable or a quality synthetic detail brush with a fine point gives the best result.
How much should I thin the paint?
Aim for a medium-thin consistency. Too watery and the line spreads and you lose control; too thick and it comes out chunky and streaky. Remember, several thin passes always beat one thick pass. A wet palette also helps you keep that consistency stable for a long time.
Can I apply edge highlight to every surface?
No. It only suits hard edges and sharp corners: armour, weapons, mechanical parts. On soft, organic surfaces like skin, cloth and fur, sharp glints do not happen in reality, so it looks fake. There, use Layering and smooth transitions instead.
Is drybrushing the same as edge highlighting?
No. Drybrushing scatters a general highlight over textured surfaces and is uncontrolled; edge highlight draws a deliberate, thin, single line on each edge. So drybrush is fast but messy, while edge highlight is slow but gives a sharp, clean result.
My line comes out shaky, what should I do?
First, steady the model with a painting handle and rest your hand on your wrist. Then hold your breath and sweep the edge in one fast stroke; drawing slowly actually creates more wobble. Also reduce the paint on the brush. If you slip, you can cover it with the base colour and try again.
What is two-stage edge highlighting for?
In short, it doubles the sense of sharpness. First you put a mid-light tone on the broad edge, then a lighter or white tone only on the very tip. This "highlight within a highlight" makes the edge look brighter and crisper; it is standard practice on display and competition-level models.
Key takeaway
In the end, edge highlighting clarifies a model's form with a thin light line along hard edges, making a big difference with very little material. The key rule is simple: keep it thin, stay loyal to one light direction, and leave little paint on the brush.
If you are ready to practice, you will find the fine-tipped brushes, highlight colours and wet palette you need in our paints, brushes & hobby supplies section.