Isn’t it annoying when you go to use paint that hasn’t been shaken in months, only to find that the pigment has settled to the bottom in one big lump. You can spend hours shaking it and it still won’t mix.
Whenever you get a figure with metal parts, keep the sections of metal sprue that they are attached to. These can be cut up into small chunks and dropped into your paint pots. Next time you need to shake the paint, they will break up the lump of pigment helping it to mix.
Simple, effective and free. 🙂