Yep, it needs shaking. The pigment settled out of the base latex.

Why haven't you taken the lid off and had a look?
You should open it and take a look to see what you see.
There's a better than fair chance it is no good.
Some paints / primers keep better then others, Kilz latex stain blocker will not keep a long time, have 2 1/2 gallons that if my paint mixer can't salvage, it's off to the paint recyclers, ****** State of California charges 75 cents on each gallon of paint for recycling every time I buy paint.![]()
To the OP: all paints need to stirred or shaken after sitting for any period of time because of settling/ separation of ingredients, varnishes should only be stirred gently, not shaken.
