I ordered about 20 different colors from Lifetone (hydromist) airbrush ready.All brand new bottles from Mckenzie I have them for about 2 months and used only about 1/8" out of each bottle. There is about 1" of hard paint in all the bottoms and the "ball" (that stirs it up) is litterly stuck. Now I know why all airbrushing has been so watery even tho shake these botltles vigorously. Now what do I do? Or what should I have been doing to keep that from happening? I am going to copy this in the bird section too I need to paint today!