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^^ yep exactly this. If it's been on the shelf for a long time chances are it's settled.
1. Stir the paint. Shaking isn't always enough. A matchstick, other end of a brush, whatever can be used.
2. If that doesn't work, acrylic medium (matt medium) is your best bet. It will thicken up the paint, but it will also alter it's properties - it will become more transparent when you do this.
3. Could leave the bottle/pot open to let it dry out but that's a last resort. Haven't done it, don't know if it would work (logically it should though), so can't recommend it.
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