Short answer: Weathering pigments are finely ground coloured powders. You brush them onto the surface, they settle into recesses and contact points as a real layer of dust, and then you lock them down with a fixer (a thin liquid that bonds the powder in place). Use them for matt, dusty effects like dust, ash, soot, rust and mud, especially on vehicles, busts, bases and dioramas.
Here is the heart of it: faking a "genuinely dusty" look with paint is hard, because paint can only suggest it. A pigment is physically a thin layer of powder, so that look comes out for real. In this space, the pigment ranges from MIG, AK Interactive, Forge World and Vallejo are the industry standard. This guide is built so that even a first-time pigment user gets a clean result, which is why we walk through every step in plain language.
What are weathering pigments and what are they for?
At its simplest, a weathering pigment (also called a powder) is dry, ground colour. The key difference from liquid paint is this: it leaves a real layer of powder on the surface rather than a film of colour. That is exactly what gives it the matt, scattered, natural dust-and-ash look.
So where does it earn its keep? On specific jobs like these: road dust under a vehicle's tracks, dry earth along the lower hull and fenders, soot around exhausts and muzzles, rough rust texture on corroded panels, and an earth layer on bases and dioramas. In short, anywhere weight and grime collect low to the ground, pigment is the right tool.
In terms of sequence, pigment is one of the final layers in a Weathering: An Overview process. It usually comes in once basecoating, washes and Chipping are done, at the "dust and dirt" stage.
How does it work?
The logic is straightforward. You brush or sprinkle the powder onto the surface, and the fine grains settle into the texture and recesses. The catch is that on its own it grips poorly and wipes off the moment you touch it, so you must fix it in place.
For fixing, you use a dedicated pigment fixer, white spirit (a mild solvent thinner), or thinned acrylic medium. Here is the critical thing to know: pigment darkens when wet and lightens again as it dries, but it never fully returns to the original tone. So even after the fixer cures, the colour sits a touch darker than the dry powder did.
This wet/dry behaviour might look like a problem at first, but it is actually an advantage you can use. Leave some areas dry for a dusty look, and wet others with extra fixer or water for a "wet mud" tone. That way, the same pigment gives you two different feels.
The bottom line is this: earth pigment brushed onto the lower part of a vehicle's tracks creates a far more realistic dust build-up than any paint could. That is because what your eye sees is real powder physically sitting there, not a shadow that paint is imitating. And that difference shows itself the moment you look at the model up close.
How do you do it, step by step?
Before you start, there is one condition to remember: pigment grips best on a matt surface. So if your model has a glossy varnish, laying down a coat of matt varnish first makes everything easier. Here is the order:
- Prep the surface: Because a matt surface holds pigment better, do matt varnish first, then pigment.
- Apply: Use a soft or medium brush to push or sprinkle pigment onto the target area. Focus on lower sections, recesses and contact points.
- Shape it: Move the powder into the distribution you want with the brush. Lift the excess off with the brush, not by blowing, because blowing kills your control.
- Fix it: Apply the fixer from the side or underneath the powder so it wicks in by capillary action (the way liquid is drawn into the powder on its own). Dripping straight onto the top scatters the pigment.
- Layer: Add a second coat of pigment over the fixed layer and fix again. That builds depth.
- Wet effect (optional): Give a few spots a wet-mud tone with extra fixer or water.
Because the fixing coats need to dry, this rarely finishes in one sitting, so don't rush; let each layer cure. As a technique it sits at the intermediate-to-advanced level, and the difficulty comes less from brush control than from fixing it correctly. Fix it wrong once and the powder leaves a ring stain that is awkward to undo, so test your first attempts on a hidden area.
Which paints and brushes?
First, let's be clear: pigment is not paint; it's a separate class of material. Here is what you need:
- Weathering pigments: MIG, AK Interactive, Forge World, Vallejo. Earth, rust, ash and dust colours are the most-used.
- Pigment fixer: Or, failing that, white spirit or thinned acrylic medium. This is the non-negotiable part of fixing.
- Soft brushes: Brushes dedicated to pigment. Don't use them for paint, because the powder contaminates them permanently.
- A mask: Fine pigment dust is inhalable. Wear a mask for your health; this isn't optional.
In short, keep pigment brushes separate from your paint brushes. This simple rule saves a lot of future headaches.
The most common mistakes
Pigment isn't really an unforgiving material, but a few classic mistakes can ruin the result. Here is what to avoid:
- Skipping the fix: Leave powder unfixed and it wipes off at the first touch, so all your effort is gone.
- Squeezing fixer from the top: Dripping on top scatters the powder and leaves a ring stain. Instead, always wick from the side or below.
- Ignoring the colour shift: Wet pigment darkens. Don't judge the final tone by the dry powder; expect it to stay a touch darker after the fixer.
- Spreading it everywhere: Coating the whole model kills realism. Instead, concentrate on lower and contact areas, and leave upper surfaces mostly clean.
Pro tips
What moves the result from amateur to clean is really just a few small habits:
- Start light: Apply a little pigment, fix it, then add more if needed. Going from too little to more is easy; pulling excess back is hard.
- Layer your tones: Use several tones instead of one colour. Dark earth over a light dust, then a touch more light dust on top; that layering builds depth.
- Follow the logic: Dust and mud collect downward with gravity, so put pigment at wheel wells, under tracks, and around foot-to-base joins, not on the high surfaces.
- Mind brush hygiene: Wipe the pigment brush on a clean cloth before changing colours, or your tones muddy together.
The shared rule across the hobby is plain: put a little on, fix it, then add more. Pulling excess pigment back is always harder than topping up a thin layer.
Frequently Asked Questions
What's the difference between pigment and normal paint?
The core difference is this: paint leaves a film of colour on the surface, while pigment leaves a real layer of dry powder. That's why pigment gives the matt, textured, genuinely dusty look. The dust, ash and dry-mud feel that's hard to fake with paint comes out exactly with pigment.
What can I use instead of pigment fixer?
A dedicated pigment fixer is the safest bet, but if you don't have one, white spirit or thinned acrylic medium also works. They all do the same job: bond the powder to the surface for good. Whichever you use, always apply it from the side or below so it wicks in by capillary action.
Will the pigment wipe off after I apply it?
If you don't fix it, yes, it wipes off at the first touch, because powder grips very weakly on its own. But once it's fixed it becomes permanent and survives handling. Never skip the fixing step; it's the single most critical part of the pigment workflow.
Can I use a pigment brush for painting too?
Don't. Fine pigment dust works into the bristles and contaminates them permanently, and then it transfers into your paint. Instead, keep separate, cheap brushes for pigment. This small split keeps both your paint and your brushes clean and saves plenty of grief later.
Which models benefit most from pigment?
It shines most on vehicle, bust, base and diorama weathering. As a rule it makes sense anywhere dust and grime gather low: wheel wells, under tracks, foot-to-base joins. On a clean, glossy hero figure, though, it usually looks overdone, so use it to fit the context.
Is pigment dust harmful to health?
The dust is very fine and inhalable, so a mask is essential. Work outdoors or in a well-ventilated space where you can, and don't blow the powder around. The health precaution isn't optional; a mask should be a fixed part of your routine when you work with pigment.
Key takeaway
To sum up: pigment is a physical layer that delivers the real dust, ash and mud feel you can't capture with paint. The keys are simple: start light on a matt surface, focus on lower and contact zones, wick the fixer from the side, and always fix it. For related effects see Mud & Dirt Effects, Rust Effects, Dust Effects and Basing Techniques.
If you want to gather pigments, fixer and soft brushes in one place, browse the shop's paints, brushes & hobby supplies; with the right materials, a clean result on your first try is far easier.