Centrifugal force alone probably isn't the best choice for mixing paints. It'll just plaster the pigment on the outside of the pot, like wet clothes going through a washing machine's spin cycle. I could see a rotary tool working if there was an attached agitator being placed directly in the paint, the same way they do at the hardware store when mixing wall paint, but with such tiny pots there's a serious risk of that ending with a disastrous mess.
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