RAL 7004 Signal Grey

RAL 7004 Signal Grey: the neutral mid grey of industry

Signal Grey is one of the most widely used greys in the RAL range, a balanced, neutral mid grey with no strong warm or cool bias. It is everywhere in industry: machine tools, control cabinets, conveyor frames, generators, lab equipment and vehicle components. That neutrality makes it one of the most practical colours on a modeler's shelf. It works for engine and chassis parts, machinery, trucks and vans, building details and workshop equipment, and it is a reliable reference tone when you are mixing lighter or darker greys for panel variation.

Getting the tone right

Neutral greys and subtle tones are unforgiving: a slightly uneven coat reads as a different shade under the clear. This colour is formulated for smooth, even coverage in thin coats, so every panel matches.

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. Let the paint cure overnight before masking or clear-coating.
5. Seal with a water-based clear coat: gloss for a factory shine, or satin or matte for work vehicles and interiors.
6. 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. Keep out of reach of children. Safety Data Sheet available on request.