Priming is the most important step between assembling a miniature and painting it. Get it right and the paint sticks beautifully; get it wrong and paint peels off, pools in recesses, or obscures detail. This guide covers everything you need to know about priming miniatures: which primer to use, how to apply it, what goes wrong and why, and the differences between spray primer, brush-on primer, and airbrush primer.
Why Priming Matters
Miniature paints — even the best acrylics from Citadel, Vallejo, or Army Painter — do not bond reliably to bare plastic or metal. Without a primer coat, paint can be rubbed off with a fingernail, chips easily at contact points, and pulls away from smooth surfaces in sheets. Primer creates a microscopic tooth on the surface that paint physically grips to. A properly primed miniature can survive years of handling, gaming, and transport without significant paint loss. An unprimed miniature will start showing chips within hours of gaming use.
Beyond adhesion, primer also sets your painting approach. Black primer pushes you toward a darker, shadow-first technique. White primer makes colours brighter and is easier for beginners to layer over. Grey primer is a neutral middle ground. And zenithal priming — spraying black from below and white from above — creates a built-in highlight map that dramatically speeds up the painting process.
Types of Primer
Spray Primer (Rattle Can)
Spray cans are the most common priming method for hobbyists. They are fast, cover evenly, and require no equipment beyond the can itself. The technique matters: shake the can for at least two minutes, spray in thin sweeping passes at 25–30 cm distance, never spray in cold or humid conditions (below 10°C or above 80% humidity), and apply two or three thin coats rather than one thick one. The most common beginner mistake is spraying too close or too slow, which creates a grainy, frosted surface called “fuzzing” — a nightmare to fix once it happens. For more detail on specific spray primer products, see our Warhammer spray primer guide.
Brush-On Primer
Brush-on primer (like Citadel Chaos Black paint used as a primer layer, or dedicated brush-on primers from Vallejo) is applied with a brush rather than a spray. It is the method to use when weather conditions prevent spraying, when you are working on individual detailed models you want to control carefully, or when you have missed spots after spray priming. Brush-on primer requires thinning and applying in thin coats — too thick and it fills detail. It is slower than spraying but gives excellent results in controlled conditions. The downside: you can see brush strokes if the primer goes on too thick, and achieving the completely even coverage of a spray takes practice.
Airbrush Primer
Dedicated airbrush primers (such as Vallejo Surface Primer or AK Interactive primers) are thin enough to spray through an airbrush at 20–25 PSI without significant thinning. Airbrushed primer gives you all the benefits of spray primer — even, thin coverage that preserves detail — combined with the precision of an airbrush. It is ideal for zenithal priming (building a black base and white highlights in a single session) and for painting indoors without needing to take models outside to spray. If you own an airbrush, this is the recommended priming method. See our best airbrush for miniatures guide if you are considering making the switch.
Black vs White vs Grey Primer: Which to Use
Black Primer
Black primer is the classic Warhammer primer colour and remains one of the most used choices in the hobby. Its key advantage: any recesses, gaps, and undercuts that the primer cannot reach are already black — and black recesses look like shadow, which immediately gives models depth and makes them look painted even before any colour goes on. Black primer works best for dark armies (Death Guard, Nighthaunt, anything with lots of metals and dark tones) and for painters who use a “dark to light” technique. The downside is that bright colours — yellows, whites, oranges — are very difficult to paint vibrantly over black primer and often require many layers to reach full saturation.
White Primer
White primer makes colours brighter and more vibrant with fewer coats. This is the choice for armies with bright colour schemes — Ultramarines blue, Stormcast gold, Sylvaneth wood tones, anything with strong highlight colours. White primer also shows detail clearly, making it easier for beginners to see where to paint. The disadvantage: any missed spots or recesses the primer did not reach will show as white gaps, which looks much worse than black gaps. White primer also shows dust and environmental contamination more obviously. For beginners painting their first brightly coloured army, white primer is often the easier starting point.
Grey Primer
Grey primer (Citadel Grey Seer, Mechanicus Standard Grey, Vallejo Grey Primer) is the neutral compromise. It does not push colours either darker or lighter as strongly as black or white, making it the most versatile base for mixed colour schemes. Many experienced painters use grey as their default because it works acceptably under any colour and does not require radically different paint application depending on what colours are going over it. Grey Seer from Citadel is particularly popular as it works well under Contrast paints — it is the official recommended base for the Contrast paint range.
Coloured Primer
The Army Painter produce a wide range of coloured primers designed to act as both primer and base coat simultaneously. If your army is predominantly one colour (Death Guard green, Space Marine blue, Khorne red), a matching coloured primer can halve your base-coating time. The trade-off is less flexibility — if you change the colour scheme partway through an army, the primer colour works against you.
How to Prime Miniatures: Step by Step
- Clean the models. Remove mould lines with a hobby knife or mould line remover tool. Wash resin models in warm soapy water and let them dry completely — resin release agent prevents primer adhesion. Metal models can benefit from a quick wash too.
- Check the weather. For rattle-can priming, temperature should be 15–25°C with low humidity (below 60–65% is ideal). Cold, hot, or humid conditions cause frosting, pooling, or adhesion failure. If conditions are wrong, use brush-on primer indoors instead.
- Shake the can thoroughly. Two full minutes of vigorous shaking is the minimum. You should hear the mixing ball rolling freely throughout. Under-shaking causes uneven primer delivery and is the cause of many primer disasters.
- Do a test spray. Before pointing the can at a miniature, spray a test burst on a piece of cardboard or a spare base. The spray should come out as a fine, even mist from the first moment. If it spits or pulses at the start, continue on the cardboard until the flow is even.
- Spray in thin sweeping passes. Hold the can 25–30 cm from the model. Move steadily; do not pause mid-stroke. Apply one light coat, wait 10–15 minutes, then rotate and apply from a different angle to catch all surfaces. Two to three thin passes give better results than one heavy one.
- Check coverage. Under good light, check for missed spots. Recesses on complex models often catch primer air but not spray — these can be touched up with thinned brush-on primer or just left as black undercuts.
- Wait before painting. Let primer cure for at least 30 minutes (ideally an hour or more in cool or humid conditions). Painting on wet primer causes lifting and peeling.
Zenithal Priming: The Technique Worth Learning
Zenithal priming is a two-stage technique that gives you a built-in lighting map before you ever pick up a brush. The method: prime the entire model black first. Then, once the black is dry, spray white from directly above — the zenithal — the direction light would naturally come from. The result is a model with black in all recesses and downward-facing surfaces, white on raised horizontal surfaces, and a smooth gradient between. When you then apply semi-transparent paints over this base, the light and shadow are already doing half the work.
Zenithal priming works best with an airbrush, where you have precise control over direction and coverage. It can be done with spray cans, but controlling the angle with a rattle can is trickier than with an airbrush. Many painters who learn zenithal priming describe it as the single biggest speed and quality improvement they made to their painting process.
Common Priming Mistakes and How to Fix Them
Frosting / Fuzzing
The model looks grainy or fuzzy rather than smooth after priming. Cause: sprayed in humidity over 70%, sprayed too close, or sprayed in cold conditions where propellant pressure was low. Fix: strip the model and reprime in better conditions, or apply a coat of gloss varnish to smooth the surface before repainting. Prevention is far easier than fixing — check conditions before every spray session.
Primer Filling Detail
Fine detail — scrollwork, facial features, scale patterns — is obscured after priming. Cause: sprayed too close or applied too many coats in one session. Fix: strip and reprime. Prevention: thin coats only. The primer should look slightly uneven and thin after the first coat — you are not trying to achieve full coverage in one pass.
Primer Not Sticking
Primer beads up on the model surface and pulls away or does not bond. Cause: oily surface from handling, resin release agent not fully washed off, or metal miniature not properly cleaned. Fix: wash the model, let it dry completely, and reprime. Always wash resin models before priming — this step is not optional.
Frequently Asked Questions
Do I need to prime miniatures before painting?
Yes. Acrylic miniature paints do not bond reliably to bare plastic or metal without a primer coat. Unprimed miniatures suffer paint chipping, peeling, and poor adhesion that make even the best painted model look poor after normal gaming use. Priming is a non-negotiable first step.
What is the best primer for Warhammer miniatures?
Citadel Chaos Black is the most widely used and consistently reliable spray primer in the Warhammer hobby community. For airbrush priming, Vallejo Surface Primer is the most commonly recommended product. For brush-on, Citadel Chaos Black paint works well thinned to a skim-milk consistency. See our full primer guide for specific product comparisons.
Can I prime miniatures indoors?
Spray can priming indoors is generally not recommended due to fumes and overspray. If you must prime indoors, airbrush primer with a spray booth is the proper solution. Brush-on primer is also a good indoor option for small batches. Never use rattle-can primer in an enclosed space without very strong ventilation.
How long should primer dry before painting?
At minimum 30 minutes at room temperature. In cool or humid conditions, wait an hour or more. Painting on primer that has not fully cured causes the paint to lift or mix with the primer, ruining the surface. When in doubt, wait longer — there is no downside to letting primer cure fully.
What primer should I use for Contrast paints?
Citadel Grey Seer or Citadel Wraithbone (a warm off-white) are the officially recommended primers for Contrast paints. The light grey / off-white base allows the semi-transparent Contrast paints to show their full saturation. Using black primer under Contrast paints gives much darker, less vibrant results — which can be intentional, but is not the typical Contrast technique.
Next step: see our spray primer product guide for specific primer recommendations, or our airbrush guide for taking priming to the next level.