Pick up two airbrushes and the most obvious difference is where the paint lives: a little cup molded into the top of the body, or a bottle hanging underneath. That is gravity feed versus siphon feed, and for miniatures and Gunpla it is one of the first real choices you make. The short version is that gravity feed has quietly won the hobby for good reasons — but siphon feed is not obsolete, and knowing why keeps you from overpaying for a config you will not use. Having spec-mapped how these two feed types behave across dozens of airbrush setups, here is the honest breakdown.
The quick answer
For miniatures, Gunpla, and scale models, buy a gravity-feed airbrush. Paint drops into the nozzle by gravity, so it sprays fine detail at low pressure, wastes almost nothing, and needs only a few drops of paint at a time. Siphon feed pulls paint up from a bottle using airflow, which needs more pressure and paint volume but shines when you are covering large areas or swapping colors constantly from pre-filled bottles. Beginners on small work: gravity, every time.
See the gravity-feed benchmark on Amazon · Check the affordable first brush
Head to head
| Gravity feed | Siphon feed | |
|---|---|---|
| Paint location | Cup on top | Bottle below |
| Feed mechanism | Gravity | Air-suction (venturi) |
| Working pressure | Low (15–25 PSI) | Higher (25–40 PSI) |
| Minimum paint | A few drops | A bottle's worth |
| Fine detail | Excellent | Good, not as fine |
| Big coverage | Fine | Excellent |
| Color changes | Rinse the cup | Swap the bottle |
Why gravity wins for small work
Gravity does the feeding, so the paint reaches the nozzle with almost no help from the air — which lets you drop the pressure into the 15–25 PSI band where fine control lives. Low pressure means less overspray, tighter lines, and the kind of soft mottling and camo work that miniature and Gunpla painters live on. It is also frugal: you can mix two drops of paint in the cup, spray a single small part, and rinse it out, wasting essentially nothing. For work measured in millimeters, that combination of low pressure and low volume is exactly right, and it is why nearly every "best first airbrush" list is gravity feed. The rest of that first-setup workflow — pressure, thinning, first spray — is in how to set up your first airbrush.
Where siphon feed still earns its place
Siphon feed is not a relic. Because it draws from a bottle, it holds far more paint than a cup, so it is genuinely better for spraying large, even areas without stopping to refill — think big scale-model bodies, terrain, or base-coating a whole army in one color. It also makes bulk color changes fast: keep several bottles pre-mixed, unclip one, clip on the next, and you are spraying a new color without scrubbing a cup. The costs are higher working pressure, more paint per session, and less finesse on tiny detail. For a painter who sprays big and repeats colors, those are fair trades.
The side-feed compromise
There is a third layout worth knowing: side feed, where a small cup or bottle plugs into the side of the airbrush and can often rotate. It splits the difference — you get gravity-fed-style low-pressure control with the option of a larger reservoir, and an unobstructed sightline over the top of the brush. It is a niche pick rather than a first buy, but if you find yourself wanting both a tiny cup for detail and a bigger one for coverage, side feed is the config that does both without owning two airbrushes.
What to buy
For essentially everyone reading this, a dual-action gravity-feed airbrush with a roughly 0.3 mm nozzle is the answer, and the only real question is budget. The Iwata Eclipse HP-CS, around $75, is the never-wrong benchmark that sprays everything from primer to fine detail. If you want the same gravity-feed layout for less, the Iwata NEO CN is the trusted affordable first brush, and a budget dual-action like the Master Airbrush G233 set gets you spraying for the least money, often bundled with both gravity and siphon cups so you can feel the difference yourself. Where each lands against the field is ranked in best airbrushes for Gunpla and best budget airbrushes under $100.
Safety
Feed type changes control, not the hazard: any airbrush turns paint into a breathable mist. Spray in a booth or at a window with a fan pulling air past you and away from your face, and wear an organic-vapor respirator for lacquers or lacquer-thinned paints. Gravity feed's lower working pressure produces a little less airborne overspray than a high-pressure siphon setup, but "less" is not "none" — ventilation is not optional with either.
The verdict
Gravity feed is the right default for miniatures, Gunpla, and scale models: low pressure, fine control, and almost no wasted paint, in the exact size range this hobby works at. Siphon feed keeps a real niche for large-area coverage and rapid bottle swaps, and side feed quietly does both, but neither should tempt a first-time buyer away from a gravity-feed 0.3 mm brush. Buy gravity, learn to thin your paint, and you will not outgrow the feed type — you will only ever upgrade the brush. To see the cup, needle, and nozzle that make gravity feed work, spin the airbrush cutaway on the bench, and compare specific brushes on our best-of hub.
A quick, honest note: some links on this page are affiliate links. As an Amazon Associate we may earn a commission when you buy through them — at no extra cost to you. It never changes the price you pay.
Questions builders ask
Is gravity feed or siphon feed better for miniatures?
Gravity feed, clearly. Paint drops into the nozzle by gravity, so it sprays at the low 15–25 PSI pressures where fine control lives, wastes almost no paint, and needs only a few drops at a time — exactly what miniature and Gunpla work demands. Siphon feed needs more pressure and paint volume and is aimed at large-area coverage, which is rarely what a mini painter is doing.
What is the difference between gravity-feed and siphon-feed airbrushes?
The difference is how paint reaches the nozzle. In a gravity-feed airbrush the paint sits in a cup on top and falls into the nozzle by gravity, so it sprays well at low pressure with tiny amounts of paint. In a siphon-feed airbrush the paint hangs in a bottle below and is pulled up by the airflow, which needs higher pressure and more paint but holds far more and makes bottle swaps fast.
Can you use a gravity-feed airbrush for large areas?
Yes. A gravity-feed airbrush covers large areas perfectly well; you just refill the cup more often than a siphon bottle would need. For most model and miniature work the areas are small enough that this never becomes a chore. Only when you are spraying big scale-model bodies, terrain, or whole armies in one color does a siphon feed's larger reservoir start to pull ahead.
What PSI should I use with a gravity-feed airbrush?
For miniatures and Gunpla, roughly 15 to 25 PSI is the working band with a gravity-feed brush, dropping toward the low end for fine detail and nudging up for primers and base coats. That low pressure is precisely why gravity feed suits detail work. Dial it in alongside your paint thinning, since pressure and consistency are two halves of the same setting.
