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Can you also explain the stirred the paint with a stir stick idea?



Take your stick and stir the paint then lift it straight up and watch the paint it will start as a stream then after a few seconds will turn to drops, the time from when you lift the stick to drops should be around 3-4 seconds.
If you haven't added thinner do a test stir to see how long it takes from stream to drops then you'll have an idea what to look for as you add thinner.