Short answer: Zenithal priming means painting a black-grey-white grayscale (a colourless light-to-dark) map on a model during the primer stage, one that fakes light coming from above. So before you paint a single colour, the model already carries ready-made shadow-and-highlight information. It is the technique to reach for when you work with transparent paints like Contrast/Speedpaint, or when you want to paint an army fast and consistently. Best of all, the whole job takes just 5-10 minutes.
What is zenithal priming and what is it for?
The name tells you almost everything: "zenith" means the point directly overhead. In the real world light mostly comes from above, so upper surfaces stay bright while undersides and recesses fall into shadow. Zenithal priming simply bakes that logic into the model while you are still at the primer stage.
The method follows the same logic. You prime the whole model black, then spray grey from slightly above, then spray white only from straight overhead. What you end up with is a sculpture that fades smoothly from black to white. As the Warhammer Guild puts it, this five-minute pass does the work of hours of hand-shading and highlighting.
So where does it really earn its keep? In three places:
- Contrast/Speedpaint workflow: Transparent paints over a zenithal reveal both shadow and highlight in a single coat. When the two come together, this is the strongest combination there is.
- A roadmap for classic painting: Before you block in colour it shows where the light comes from, so when you do layering (stacked coats) or glazing (transparent colour transitions) you already know where the highlights and shadows belong.
- Batch painting: It is one of the most efficient ways to give a whole army fast, consistent light and shadow.
How does it work? The physics underneath
The whole trick lives in the value of the paint. Acrylic paint is affected by the value (the lightness or darkness) underneath it. Because thin, transparent paints let the grey below show through, the grayscale underneath directly modulates how bright the colour on top reads.
In practice this means a colour painted over white looks bright, while the same colour over black looks dark. Zenithal priming turns exactly that physics into a pre-shading tool (a way to set up shadow before you paint). Lay down one colour and the map below automatically makes it dark in the recesses and bright on the raised areas.
The whole trick rests on value: set up the lightness-and-darkness map first, and any colour you put on top inherits that map for free.
That is why a correctly built zenithal makes even the simplest paint job look like it has real volume. The magic is not in the paint, it is in the grey underneath. By the same token, paint over it with an opaque colour and the magic breaks, because you have covered up that entire map of light.
How do you do it step by step?
The classic method has three stages, and the logic is simple: black (shadow) > grey (mid-tone) > white (light). The only rule is not to rush; keep every coat thin and gradual.
- Black base: First, prime the entire model black. This coat defines the deepest shadow and forms the floor for the whole map.
- Grey at 45 degrees: Once the black is dry, spray grey (or white reduced down) at roughly a 45-degree angle, slightly from above. Top and side surfaces turn grey while the lower recesses stay black.
- White from the top: Finally, spray white only from directly overhead, at a steep angle and sparingly. Only the topmost raised surfaces should go white, and the transitions should form a soft gradient (a smooth colour shift).
When you finish, the model fades from black to grey to white. Checking it is easy too: hold a phone torch directly above, and if the light lands where your white is, the zenithal has worked.
As techniques go, zenithal sits between beginner and intermediate, meaning it is easy to grasp but dramatic in result. Beyond the right kit, it asks for no special brush skill either. Even on your first model, if you build the three coats patiently and from a distance, the result will surprise you.
What tools can you use?
Here is the good news: you can get the same result on three different budgets. Whatever your budget, the core logic never changes; only the smoothness of the transitions does.
- Airbrush: The smoothest, most controlled gradient, and the professional standard. If you want to manage the overhead light to the millimetre, the airbrush is your tool.
- Spray can: Fast and more than good enough. Transitions are a touch harder, but for an army it does the job well. Just hold the can far from the model and build in thin coats.
- Drybrush (the cheapest version): No airbrush or spray? Do not worry. Drybrush grey and then white downward over a black primer and you get a very similar effect. This same approach is the foundation of Slapchop.
The most common mistakes
Zenithal is easy to grasp, but it does have a few traps. Most beginners make the same handful of errors, so know them in advance and you will get a good result on the first try.
- Spraying white too wide: Do this and everything turns light grey and the contrast vanishes. White should be sparing and selective, only on the highest raised areas.
- Lighting from the side: Miss the angle and spray from the side, and you get unnatural, confusing shadows. Remember, white always comes from directly above.
- Hard, blotchy transitions: Spray too close and the gradient blotches. The fix is simple: keep your distance and build thin, gradual coats.
- Burying it under opaque paint: An opaque (covering) paint smothers all the zenithal information. To see the benefit, what goes on top must be a transparent/thin paint, a glaze or Contrast.
Pro tips
A few small tweaks can move zenithal from "it works" to "display quality."
- Warm gradient trick: As Tale of Painters suggests, instead of pure black to pure white, go from a warm dark grey to a light ivory. The base then reads more natural and warm, especially under skin and wood tones.
- Zenithal + glaze: Adding colour with thin glaze layers over a zenithal is an advanced display technique. The colour rides on top without smothering the map, so the result is both voluminous and saturated.
- Torch test: Once the primer is done, hold a phone torch overhead. If the light lands where your zenithal white sits, your painting plan is ready.
- Lock it with matt varnish: Settling a thin matt varnish before you apply transparent paint helps the next coats glide more controllably and reduces brush marks.
Frequently Asked Questions
Do I need an airbrush for zenithal priming?
No, you do not. An airbrush gives the smoothest transition but it is not required. A spray can gives a fast, perfectly usable result; with no kit at all, you can drybrush grey then white downward over a black primer and build the same light-and-shadow map.
What paints should go over a zenithal?
Transparent or thin paints. Contrast and Speedpaint are the strongest combo with zenithal because they show both shadow and highlight in one coat. In classic painting, thin your paint into a glaze and the map below sets the brightness automatically. Opaque paint, on the other hand, smothers the information.
How long does zenithal take?
Five to ten minutes, drying aside. Just three quick coats do it: a black base, grey at 45 degrees, and a little white from the top. That is the real win, because the pre-shading and highlighting that would take hours by hand is baked onto the model in minutes. It is ideal for beginner to intermediate painters.
Is slapchop the same as zenithal?
Not exactly, but they are relatives. Slapchop builds the zenithal logic with drybrushing: black primer, grey drybrush, white drybrush, then Contrast on top. Zenithal usually builds a soft gradient with airbrush or spray, while slapchop gives a more textured finish with the brush.
How do I add colour after a zenithal?
In thin coats. Thin your paint with water or a glaze medium and apply it without flooding the recesses. With Contrast, you can go straight on in a single coat. In classic painting, read the zenithal as a roadmap: plan highlights where it is white and shadows where it is black.
How much white should I apply?
Not much. The most common mistake is spraying white too wide; then the contrast is lost and everything turns light grey. Let only the highest raised surfaces go white. When in doubt apply less, because the resulting gradient is always more convincing than a flat screen of white.
The key takeaway
In short, zenithal priming gives a model a light-and-shadow skeleton before you paint it. Three coats of black-grey-white, five minutes, and every transparent paint on top inherits that map for free. It is the fastest volume trick for a beginner and the foundation of a display technique for a master.
To go further, lock in the basics with Priming & Undercoating and Undercoat Colour Strategy; then continue with Contrast & Speedpaint Systems, or for the advanced route, Zenithal Underpainting + Glazing Workflow. For the primer, airbrush and brushes you need, browse our paints, brushes & hobby supplies.