An airbrush sprays paint as a fine mist, giving thin, perfectly even coats that are hard to achieve with a brush. For Warhammer 40,000 painters, it turns priming, basecoating vehicles and smooth highlights into minutes of work rather than hours.
The short answer: start with a dual-action, gravity-feed airbrush with a 0.3–0.4mm needle and a compressor with a moisture trap. Thin your paint to the consistency of milk, spray at roughly 15–25 psi, and clean the airbrush every time you change colour.
Do I need an airbrush to paint miniatures?
No. Plenty of brilliant painters never use one. An airbrush is a time-saver and a tool for effects like smooth blends and glows, not a requirement.
What is an airbrush best for?
Priming, basecoating large models and vehicles, zenithal highlights and smooth transitions on big panels. Fine detail, edge highlights and faces are still brush work.
What do I need to get started?
An airbrush, a compressor, a hose, airbrush thinner or flow improver, a cleaning pot and airbrush cleaner. A spray booth or extraction fan and a suitable mask are strongly recommended for indoor use.
Single action or dual action?
Dual action, where pressing the trigger controls air and pulling it back controls paint, is the standard choice for miniatures because it gives much finer control. Single-action airbrushes are simpler but better suited to flat basecoats.
What needle size should I choose?
A 0.3mm or 0.4mm needle covers most miniature work, from priming to basecoats. A 0.2mm needle allows finer lines but clogs more easily with thicker paint. Many beginners find 0.3mm the best all-rounder.
What compressor do I need?
One with a tank, a pressure regulator and a moisture trap gives steady airflow and stops water spitting from the nozzle. Quieter models are worth paying for if you paint in a shared space.
What pressure should I spray at?
Around 15–25 psi suits most acrylic paints. Go lower for fine work close to the model and slightly higher for primer and thicker paints. Always test on card or spare plastic first.
How do I thin paint for an airbrush?
Aim for the consistency of milk. Add airbrush thinner or flow improver a few drops at a time rather than plain water, which can make paint break up and dry on the needle tip. Airbrush-ready paints come pre-thinned and are the easiest place to start; our guide to thinning paints explains consistency more generally.
Can I use normal hobby paints in an airbrush?
Yes, once they're thinned properly. Metallics and inks spray well, and one-coat paints can be airbrushed for fast, smooth results. Thicker paints need more thinner and more frequent tip cleaning.
How do I prime with an airbrush?
Use a primer made for airbrushing, spray light coats from several angles, and let each coat dry before the next. Avoid flooding detail with one heavy pass. Our guide to priming properly covers primer colours.
How do I do a zenithal highlight?
Prime the model black or dark grey, spray a lighter grey from about 45 degrees above, then a light coat of white from directly overhead. The result maps natural light onto the model and works brilliantly under translucent colours such as yellow armour.
How far from the model should I hold the airbrush?
Around 10–15cm for general coverage, and closer for small areas at lower pressure. Too far away and the paint dries in the air before landing, leaving a rough, dusty texture.
Why is my airbrush spattering or clogging?
The usual causes are paint that's too thick, dried paint on the needle tip, or pressure that's too low for the paint. Wipe the tip regularly, thin the paint a little more, and check the needle isn't bent.
How do I clean an airbrush?
Flush water or cleaner through between colours, spraying into a cleaning pot until it runs clear. At the end of each session, strip and clean the nozzle and needle properly. Handle the needle carefully, because a bent tip ruins the spray pattern.
Is airbrushing safe indoors?
Overspray hangs in the air, so use extraction such as a spray booth vented outside, and wear a mask rated for fine particles. Acrylic paints are much friendlier than solvent-based ones, but you still shouldn't breathe the mist.
What should I practise on first?
Spare sprue, an old model or a large vehicle. Practise even coats, smooth fades and clean colour changes before moving on to finished models. Big flat panels show the benefits fastest, and a little battle damage afterwards hides early mistakes nicely.
More hobby guides
- How to Prime Warhammer 40,000 Miniatures Properly
- How to Thin Paints for Warhammer 40,000 Miniatures
- How to Paint Red Armour on Warhammer 40,000 Miniatures
- How to Paint Yellow Armour on Warhammer 40,000 Miniatures
- How to Paint Glowing Effects on Warhammer 40,000 Miniatures (OSL)
- Warhammer 40,000 Hobby Guides & Free Tools
Warhammer 40,000® is a registered trade mark of Games Workshop Limited. This is an independent hobby guide and is not affiliated with, endorsed or sponsored by Games Workshop.