How to Paint Metallics on Miniatures Without Streaks

Quick answer

Streaks happen when metallic pigment is not evenly suspended or when you drag a partly dry layer across the surface. Fix it by shaking the pot hard, loading the brush so it flows rather than scrubs, and applying two thin coats instead of one heavy one. If you need a flawless finish over a large area, switch to an airbrush-ready metallic.

You have probably seen it: a shoulder pad or sword blade that looks patchy, with lighter and darker bands where your brush passed. Metallic paint streaks are one of the most common miniature painting problems, and they are rarely caused by a bad pot of paint.

The good news is that streaks are diagnosable. Once you know whether the cause is the paint, the tool, or the technique, the fix is usually a small change rather than a full repaint.

Why metallics streak more than regular acrylics

Metallic acrylics contain tiny metal flakes, often aluminium, suspended in a binder. Those flakes need to lie flat and overlap to create a smooth reflective surface. If the paint dries before the flakes settle, or if you spread it too thin in one pass, the flakes end up scattered and the layer looks streaky.

This is also why metallic paint problems often appear on large flat areas such as vehicle panels and cloaks. A brush leaves directional marks, and on a flat surface there is nowhere for those marks to hide. Breaking the area into smaller passes and letting each one level out helps the flakes align.

• Shake the pot for at least 30 seconds, then stir with a brush handle or mixing ball to lift pigment from the bottom.
• Do not thin metallics with water alone if you can avoid it; a dedicated medium keeps the binder strong.

Symptom: visible brush lines that will not level

If you can see parallel lines following your brush stroke, the paint is usually too thin or the brush is too dry. The pigment is being dragged rather than deposited. Load the brush, then wick the excess onto a paper towel so it flows without flooding the detail.

Apply the next coat at roughly 90 degrees to the first. Cross-hatching breaks up the direction of the streaks and gives the flakes a better chance to overlap evenly.

• Work in one direction per coat, then change direction on the next coat.
• Let each coat dry fully before adding the next one; touching tacky metallic paint tears the layer.

Symptom: patchy coverage with dark spots showing through

Dark spots usually mean the layer is too thin over a dark primer or base coat. Metallics are semi-translucent, so whatever is underneath influences the final colour. A black undercoat will make a silver look grey and patchy until you build up several coats.

A practical fix is to base the area in a mid-tone that matches the metal, then apply your metallic over it. Two thin coats over a suitable base give more consistent coverage than four coats over black.

• Prime or base in a colour close to the metal you want, not pure black.
• Build coverage in thin layers rather than one thick coat that fills detail.

Symptom: the finish looks dull or grainy after drying

A grainy or chalky finish often comes from over-thinning or from paint that has partially dried in the pot. If the medium has separated, the binder cannot hold the flakes flat, so the surface scatters light instead of reflecting it.

For a reliable flow, use a medium that also acts as a flow improver. Airbrush Medium, 100 ml works as both a thinner and a flow improver for acrylic paints, and it comes in a precision dropper bottle so you can add it in small, controlled amounts. It is designed to let you use any Warpaint in an airbrush, and it also works with other brands of high quality acrylic paints.

• Add medium a drop at a time; you want the paint to flow off the brush, not run like water.
• If a pot has been open for a long time, stir rather than shake to check for separated binder.

When to stop brushing and switch to an airbrush

If you have tried thin coats, cross-hatching, and a proper medium and the surface still shows streaks, the problem is the delivery method, not your brush control. Large flat panels, vehicle hulls, and power armour are the classic cases where a brush will always leave some texture.

Warpaints Air Metallics: Night Scales is airbrush-ready right from the bottle with no thinning required, and the bottles include pre-loaded mixing balls. The range is developed in a Colour Triad System, so matching base and highlight colours exist for consistent shading. Warpaints Air Fluorescent: Gauss Green follows the same pre-mixed, airbrush-ready approach if you want a bright accent rather than a true metal.

• Airbrush in light, even passes and let each pass flash off before the next.
• If you do not own an airbrush, a rattle-can metallic primer is a reasonable alternative for whole-army work.

Diagnose your streaky metallics

• Brush lines that follow your stroke: The paint is too thin or the brush is too dry, so pigment is being dragged instead of deposited. Reload, wick excess onto a towel, and cross-hatch the next coat.
• Patchy coverage with dark undercoat showing: Metallics are semi-translucent, so a dark primer or base coat shows through thin layers. Base the area in a mid-tone close to the metal before applying the metallic.
• Dull or grainy finish after drying: Over-thinning or separated binder stops the flakes lying flat, so light scatters instead of reflecting. Add a thinner and flow improver such as Airbrush Medium in small drops and stir thoroughly.
• Streaks persist on large flat areas: A brush will always leave some directional texture on a broad panel, no matter how good your technique is. Stop brushing and switch to an airbrush-ready metallic, or accept a slightly textured finish on rank-and-file models.

Products that help with smooth metallic paint

• Warpaints Air Metallics: Night Scales: Airbrush-ready right from the bottle with no thinning required, and pre-loaded mixing balls. Removes the guesswork of thinning metallics for an airbrush, which is where many streaks start.
• Airbrush Medium, 100 ml: Works as a thinner for acrylic paints and as a flow improver, in a precision dropper bottle. Gives you controlled thinning for brush work and airbrush work without weakening the binder.
• Speedpaint: Talos Bronze: A one-coat painting solution with consistent flow across all colours and an intense shading and highlighting effect. Useful when you want a metallic look on many models quickly rather than a perfectly flat reflective finish.
• Warpaints Fanatic Metallic: Death Metal: A deep green-brown metallic using a proprietary blend of aluminium and mica for coverage and sheen. A good example of how metallic colour choice, not just technique, changes how streaks read on the model.

Streaky metallics are almost always a loading, thinning, or undercoat issue rather than a fault in the paint. Fix those three things and most miniatures will come out smooth. When they do not, that is your signal to stop fighting the brush and reach for an airbrush-ready metallic instead.