Onyx Grey Mercedes

Onyx Grey: a deep German charcoal metallic

Onyx Grey is a dark grey metallic from the Mercedes-Benz palette, a deep, slightly cool charcoal that suits the long, formal lines of the brand's saloons and estates. Dark metallic greys like this became popular as a more discreet alternative to black: they hide less of the car's shape and show off chrome trim and alloy wheels. For modelers, Onyx Grey is a useful everyday colour for Mercedes and other German executive cars in 1:24 and 1:43, and a good dark metallic for any model that needs a sober, upmarket finish.

The problem with metallics

Metallics are unforgiving. Spray too wet and the flake settles unevenly into dark patches and stripes; spray too dry and the surface goes grainy. Keep the airbrush moving at a constant distance and use slightly drier, well-atomised passes for an even flake across the whole body.

How to apply

1. Shake the bottle for at least 60 seconds.
2. Prime with a grey primer and let it dry fully.
3. Airbrush straight from the bottle, no thinning needed. Use a 0.2–0.4 mm nozzle at around 20 PSI (1.4 bar) and apply light, cross-hatched coats, letting each one flash off before the next.
4. Keep the airbrush moving at a constant distance for an even effect.
5. Let the paint cure overnight before masking or clear-coating.
6. Seal with a water-based clear coat: gloss for a factory shine, or satin or matte for work vehicles and interiors.
7. Clean the airbrush with water before the paint dries.

Why modelers choose Koloi Aqua

• Ready to spray: no guessing thinning ratios, the same result from every bottle
• Cleans up with water, so there are no strong solvent fumes at the bench
• Fine pigment grind for 1:8 to 1:72 scales, so panel lines and detail stay crisp
• One system: primer, colour and clear designed to work together

Shelf life

Estimated shelf life of more than 12 months when stored tightly closed between +10 °C and +28 °C, away from frost and direct sunlight. Shake well before use; if the paint has thickened or separated and does not remix, do not use it.

💡 Need a colour we don’t list? Our colour lab matches RAL, RLM and OEM paint codes on request.

The on-screen image is indicative: the final tone depends on the primer, the number of coats and the clear coat. Metallic, pearl and multi-layer effects cannot be fully represented on screen. Keep out of reach of children. Safety Data Sheet available on request.

Vehicle, manufacturer, team and sponsor names are used only to identify the colour reference. Fire Scale Modeler is not affiliated with or endorsed by the trademark owners.