October 28, 2026
Zenithal Priming Explained: Planning Light Before You Paint
Zenithal priming maps a miniature's light and shadow before the first colored paint goes on. Apply a darker undercoat over the model and add a lighter one from above so raised surfaces catch it while undersides remain darker. This is a lighting plan, not a magic coating: it works best when you choose a consistent imagined light direction and paint over it without burying every value change.
Decide where the light is coming from
Imagine a single bright light above the character. The top of the helmet, shoulders, arms and upper folds receive the lightest values; the undersides of plates and deepest cloth folds remain darker. A top-down direction is intuitive for outdoor daylight, while a front-and-above direction may help a display model face the viewer.
Turn the model in your hand and picture it lit before spraying. The 'zenith' is the high point in the sky, but hobby painters sometimes use an angled light source. The key is consistency: if the upper right is brightly undercoated, highlights added later should generally reinforce that lighting choice.
Build the dark foundation
Prepare and clean the miniature and select a material-compatible dark primer. Apply it exactly according to the product's instructions, with good ventilation and safe outdoor spray conditions where applicable. Use thin coats that preserve small texture. Let the dark layer dry as required before adding anything over it.
Black is the classic shadow undercoat, but charcoal, dark brown or other colors can work. The Army Painter's zenithal guide demonstrates black followed by white, while its explanatory dictionary notes that the meaningful ingredient is a directional light-to-dark contrast rather than fixed paint names.
Add the light from above, not from every angle
Use the lighter primer or approved airbrush paint from the chosen direction. Short, controlled applications should catch head, shoulders and raised front-facing planes while avoiding blanket coverage of undersides. One heavy coat can erase both the sculpted detail and the intended value transition. Check the model from below before declaring the zenithal finished.
Do not assume a universal spray distance or number of passes; follow the exact primer and equipment instructions. Airbrush users should follow the equipment's material, ventilation and cleaning guidance, and spray-can users must observe aerosol weather and ignition warnings.
Read the result before adding color
Under a neutral lamp, inspect the miniature. Can you see the face, armor layers and folds from a normal viewing distance? Does the lighting direction feel coherent? If a high edge is very dark because it was shielded during spraying, you may add a careful light touch by a manufacturer-compatible brush or drybrush method after proper drying.
If everything looks flat white, the light pass probably covered too much. If the undercoat is gritty, examine temperature, humidity, shaking and application method before spraying more. Do not sand fragile fine detail aggressively just to 'fix' an incorrect primer coat.
Choose paint transparency deliberately
Thin, translucent colors can preserve some of the black-to-white underpainting visually. Opaque base coats can cover most of that value map, so deliberately add shadows and highlights during later layers if you prefer that method. Contrast and Speedpaint systems are often used over lighter undercoats, but a black-to-white map may make their dark recesses much deeper.
Try an example on a spare shield: apply the same transparent blue over an evenly white half and a dark-to-light primed half. Compare the resulting value distribution after it dries. This is a suggested test, not a claim of measured coverage or a guarantee that any particular brand will behave identically.
Common mistakes and how to revise them
A bright lower torso may indicate the light spray came from too low an angle; plan a stricter upper direction on the next model. Dark faces may need a small additional light accent to remain legible. Oversprayed white recesses reduce depth and may need deliberate shading with compatible paints. A chalky finish points toward application conditions or paint compatibility, not necessarily the light direction.
The purpose of zenithal is to make later decisions easier. Once the model has a clear value map, select base colors that preserve it where useful, reinforce the brightest edges and accept that some areas will remain dark. That is more valuable than chasing a mathematically perfect gradient.
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