Short answer: Crackle paint is a special paste that cracks on its own as it dries. You reach for it when you want a dried lake bed, desert ground, cracked mud or dry lava crust. The method is simple: you apply it thick, leave it alone to dry, and the dark colour underneath shows through the cracks for instant, believable depth.
It earns its keep most on miniature bases (the base being the small platform your figure stands on). In arid, desert and volcanic themes, a few minutes of work gives you serious texture; better still, even a first-timer gets a usable result on the first try. The only real rule is this: lay it on thick, be patient, and don't touch it.
What is crackle paint and what is it for?
Let's start by pinning down what the product actually is. Crackle paint is a technical product that shrinks and cracks as it dries, and it behaves more like a paste than a paint. Once it cures, real fissures open across the surface, and the colour you left underneath shows through the bottom of every crack.
In practice this hands you a ready-made dry-earth texture. That makes it ideal for a desert outpost, an abandoned battlefield, a Martian surface or the edge of a dried-up bog; it even works as a diorama floor on its own. As for products, on the Citadel side Agrellan Earth gives a fine crack, Agrellan Badland is the coloured variant, and Martian Ironearth and Ironcrust offer a red, Mars-themed look. Alongside those, Vallejo and AK make their own crackle mediums too. One more trick: by laying the same product at different thicknesses you can vary crack size within a single base, and a big crack in the centre with fine ones at the edges adds a whole extra layer of realism.
Crackle belongs to the texture-paste and technical-paint family; for the wider picture, see the Texture Paste & Technical Paints guide.
How does it work?
Understanding the logic makes the application easier. Crackle paste is a formula engineered to shrink as it cures, so when you spread it, the top layer dries and tightens faster than the layer beneath. That tension pulls the paste apart, which is how the crack pattern forms by itself.
The real secret is in the thickness, because crack size depends entirely on how thick you lay the coat:
- Thick coat: large, deep cracks and slower drying.
- Thin coat: small, dense cracks, or no cracking at all.
Since the surface beneath shows through the gaps, the colour you paint before the crackle decides the colour at the bottom of each crack. So if you leave a dark base, the crack bottoms read like shadow and the texture gains depth.
How do you do it step by step?
The sequence below is for a dry-earth or cracked-mud effect on a base. Keep in mind that crackle is a thick-applied, leave-it-to-dry product, so not rushing is the one golden rule.
- Base colour (crack bottom): First, paint the colour you want to see at the bottom of the cracks. A dark brown or shadow tone is the usual choice, because this colour sets the sense of depth.
- Apply the crackle: Next, spread the paste thick and even. Use a spatula or an old brush you don't mind ruining. Thin coats won't crack, so commit to a generous layer in one pass.
- Don't touch it, let it dry: Now leave it to crack on its own. Touching it, blowing on it or stirring it will wreck the pattern. The thicker the coat, the larger and slower the cracks.
- Colour it up: Once it is fully dry, drybrush (load a brush, wipe most of the paint off, then graze only the raised parts) the surface with a light earth or sand tone, and let the crack bottoms stay dark. Here, contrast equals depth. If you like, pull a wash (a thin shade) into the cracks to darken them further.
- Add detail: Finally, drop in static grass, tufts of dry vegetation and a few rocks. Keep the planting sparse so it still reads as arid ground.
Two core techniques carry these steps: for the base colour, the logic of Basecoating applies; for the final colouring, Drybrushing and Washing, Shading & Pin Wash are the two you'll lean on.
Which paints and tools?
The good news is you don't need expensive gear; the right product and a spatula will do. The shopping list is short too:
- Crackle product: Citadel Agrellan Earth (fine crack), Agrellan Badland (coloured), Martian Ironearth / Ironcrust (red Mars), or Vallejo / AK crackle medium.
- Base colour paint: a dark brown or shadow-tone basecoat.
- Drybrush colours: light earth and sand tones for the raised surface.
- Application tool: a spatula or a sacrificial old brush, since crackle is hard on bristles.
- Optional: a wash, static grass, dry tufts and small rocks.
The most common mistakes
Crackle isn't an unforgiving technique, but four classic mistakes will make it look bad. Tellingly, all of them come down to patience at the moment of application.
- Applying it too thin: This is the number-one mistake. A thin coat won't crack, so you have to lay it on generously and thick.
- Touching it while it dries: Poking or stirring the paste mid-cure scatters the crack pattern. Apply once, then walk away.
- Skipping the base colour: With no colour at the crack bottom, the cracks look flat and contrast-free, and the depth disappears.
- Working it too early: Doing anything heavy on still-wet crackle (gluing, pressing) ruins the surface, so wait for it to cure fully.
Pro tips
A few small adjustments take the result from amateur to convincing. Most of it is simply playing with thickness and contrast.
- Control crack size with thickness: lay it thick for large cracks, a medium coat for fine cracks.
- Keep the base colour dark. Dark bottoms read as shadow and give the texture automatic depth.
- The maximum-contrast formula is this: a light drybrush on top plus a dark wash in the cracks. That pairing makes the cracks pop the hardest.
- Crack character varies between brands, so test a couple of products on a scrap piece to find the pattern you want.
- On arid themes, go light on vegetation, because too much greenery breaks the dry-earth illusion.
The repeated rule of thumb in the hobby is blunt: crack size lives in your coat thickness, not your brush. Lay it thick for big cracks; lay it thin for dense little ones, or none at all.
Frequently Asked Questions
Why won't my crackle paint crack?
There's almost always one cause: you applied it too thin. Crackle only tightens and splits in a sufficiently thick coat, so the fix is simple. Lay a generous, even layer with a spatula and leave it to dry without touching it. Thin coats give tiny cracks, or none at all.
How long does crackle paint take to dry?
The application itself is quick, but cracking and full curing can take a few hours. As a rule, the thicker the coat, the slower it dries and the larger the cracks. Rush in and work over it and you'll ruin the pattern, so patience gives the best result.
What colour should I paint before the crackle?
You paint the colour you want to see at the bottom of the cracks underneath. A dark brown or shadow tone is the usual pick, because dark bottoms read as shadow and add depth. By contrast, skip the base colour and the cracks look flat and contrast-free.
How do I make the cracks bigger?
The only variable here is thickness. A thicker coat produces larger, deeper cracks, while a thin coat gives small, dense ones. So if you want big cracks, pile the paste on generously and allow a longer drying time for the tension to build.
Can I use crackle on the miniature itself, or only on bases?
Its most natural home is the base, where it looks great on dry-earth, desert and volcanic ground. You can use it on a model's body for a cracked-surface effect too, but the texture is hard to control over fine detail. For that reason, it's wise to try it on a base or scrap piece first.
Can I wash and drybrush over crackle?
Yes, and you should. Once it is fully dry, drybrushing the raised surface with a light tone and pulling a dark wash into the crack bottoms maxes out the contrast. That combination is where the texture looks its most realistic and deep.
What's the difference between Agrellan Earth and Martian Ironearth?
Both are Citadel crackle products, but their character differs. Specifically, Agrellan Earth gives a fine, neutral earth crack, while Martian Ironearth offers a red, Mars-themed tone. So pick by the pattern and colour you want, and if you're unsure, test both on a small scrap piece.
Key takeaway and next step
In the end, crackle rests on one principle: lay it thick, leave it alone, then colour it with contrast. In other words, keep the base dark, hit the top with a light drybrush, deepen the crack bottoms with a wash, and the product handles the rest.
You'll use this mostly in basework, so Basing Techniques and Mud & Dirt Effects are the natural follow-ups. When you're ready to try it, browse the shop for the paints, brushes & hobby supplies you'll need.