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Originally Posted by Fastphil
With bottles, when you shake them before using, a lot of paint ends up on the underside of the cap and then when you screw it back on, it squshes between the bottle and the cap. The paint then dries, but not evenly all the way around, which then allows air to get into the bottle and the paint to evaporate. That's how you end up with thick and goobery paint.
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This is exactly why you shouldn't shake paints up to mix the pigments and solvents, you actually waste paint by shaking them up.
Not only that, but shaking them really doesn't agitate them as well as stirring with a toothpick for a few minutes. When you stir, you are able to get to the very bottom of the jar and agitate all the settled pigment, which is what you want to do.
Thoroughly stirring is the way to go.