Quick answer

Use a dedicated paint stirrer or metal mixing balls to break up settled pigment and ensure even color. Shaking alone often leaves clumps, especially with matte or metallic paints.

Why shaking alone isn't enough

Model paints like Mr. Color contain heavy pigments that settle over time. A vigorous shake may not break up the sediment at the bottom, leading to uneven color on your model. A stirrer or mixing ball physically agitates the paint so every drop is consistent.

Metal mixing balls are especially effective because they roll inside the bottle and dislodge clumps without introducing air bubbles. A stirrer works well for small batches or when you need to measure out paint with the built-in spoon.

Choosing between a stirrer and mixing balls

Both tools are inexpensive and serve the same core purpose, but each has a slight edge depending on your workflow. A stirrer gives you direct control and lets you scrape the bottom of the bottle. Mixing balls are hands-off — just drop them in and shake.

One tradeoff: mixing balls can be hard to remove from the bottle if you don't have a magnet or strainer. Stirrers require cleaning after each use. Choose based on whether you prefer convenience or control.

Step-by-step: How to mix model paint properly

  1. Step 1: Shake the bottle first: Close the lid tightly and shake the bottle vigorously for about 30 seconds. This loosens the top layer of pigment and prepares the paint for deeper mixing. Don't skip this step — shaking alone won't fully mix the paint, but it helps the stirrer or balls work more effectively.
  2. Step 2: Add mixing balls or use a stirrer: If using metal balls, drop 3 to 4 into the bottle, close it, and shake again for another 30 seconds. If using a stirrer, insert the flat end and scrape the bottom and sides of the container, then stir in a circular motion for about a minute. Common mistake: adding too many balls can make shaking difficult. Stick to 3–4 for standard 10ml bottles.
  3. Step 3: Check consistency on a palette: Dip a brush into the paint and apply a small amount to a palette or scrap plastic. Look for an even color without streaks or clumps. If you see separation, stir or shake a bit more. If the paint still looks grainy, your mixing tool may not have reached the bottom. Try a different angle or add one more ball.

Products that help

  • Mr. HOBBY Mr. Churning for Metal Ball (GT73): Putting 3 to 4 of these metal balls into a container of Mr. Color or any water based hobby colors will be used to stir the paints. The paint won't easily clump up with matte, metallic, and pearl. These balls reach the bottom of the bottle and break up settled pigment without adding air, giving you smooth paint even for tricky finishes.

    Mr. HOBBY Mr. Churning for Metal Ball (GT73)

    Mr. HOBBY Mr. Churning for Metal Ball (GT73)

  • Tamiya Paint Stirrer: This tool has a long flat end for stirring, and a little spoon on the other end for measuring out paints or powders. The flat end stirs thoroughly while the spoon lets you measure small amounts, reducing waste and keeping your ratios accurate.

    Tamiya Paint Stirrer

    Tamiya Paint Stirrer