I have used other caps that have tiny cracks that make it difficult to shake vigorously. You were perfect. I've had paint in them for a few weeks now and they don't seem to be thickening so I'm guessing they are very good plastic. Measurement markings on the side are also handy. I mix all of the paint in a 1:1 ratio, then add more Floetrol water and medium as they are poured into the cups. It works well enough and I'll be buying more when my studio is done.
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