The Best Primer for Miniatures

How we picked

Primer has exactly two jobs: give acrylic paint a surface it can key into, and unify the color of a model that may be gray plastic, clear plastic and resin at once. Everything else is about how easy it is to get a good coat on.

• Finish smoothness. A grainy primer coat cannot be fixed by painting over it, so this is the first criterion.
• Can you use it where you live? An aerosol needs dry, temperate outdoor space. A large share of painters do not have that for much of the year, and a primer you cannot use is not a good primer.
• Adhesion. Does paint stay on after handling?
• Cost per model. Large bottles prime an army for the price of two cans.

These picks come from the manufacturers’ published specifications and the reasoning laid out here, not from a controlled test of every primer on identical models. That standard is in our review policy.

The real decision is not the brand

Two choices matter far more than which brand you buy, and both get less attention than they deserve.

Color. Black gives you shadows for free and makes every light color miserable. White does the opposite. Gray is the compromise and usually the right answer for a first army. If you are using one-coat paints, a light primer is not a preference but a requirement. The full comparison is in black vs white vs gray.

Application method. Aerosol, brush-on or airbrush, and this is mostly a question of where you live and what you own rather than of quality.

The three methods

Aerosol is fastest and smoothest, and it has one hard constraint: weather. Spray primer applied in damp or cold air part-dries before it lands, and the pigment arrives as dust rather than a wet film — a finish like fine sandpaper that cannot be painted smooth. If your climate is humid, this is not a theoretical risk, and the mechanism is explained here. See the spray primer picks.

Brush-on works in any room on any day. Slower, and a heavy hand fills detail, so it wants two thin coats rather than one confident one. For anyone without outdoor space this is the answer — priming indoors covers the technique.

Airbrush is the best of both: thinner than an aerosol, smoother than a brush, no weather window, minimal fumes with a water-based primer. It only makes sense if you already own a compressor. See the airbrush primer picks.

How to actually apply it

More primer problems come from technique than from product, so:

1. Shake the can for a full minute. Longer than feels necessary. Under- mixed primer sprays unevenly and grainy.
2. Check the weather. Dry, temperate, not humid. If in doubt, do not.
3. Spray from about 20 cm in short passes across the model, not at it. Keep the can moving.
4. Build to opacity in two or three light passes, not one wet one. One heavy pass fills every panel line and you never get that detail back.
5. Rotate and repeat — from above, from each side, and from below for the undersides of arms and cloaks.
6. Leave it overnight before painting. Touch-dry in half an hour, cured hard in considerably longer. Handling it early is how primer peels at contact points later.

Different materials need different handling

Plastic takes primer straight from the box. Resin and metal do not, and the reason is residue: resin models carry mold release agent and metal carries machining oil, and primer will not key to either. Both need washing in warm soapy water and drying completely first. Details in priming resin and metal.

And if you are wondering whether you can skip all of this, the honest answer is here.