I bought these acrylic paint bottles and they work well for this purpose. They are very soft and the tip makes it easy to control the amount of paint squeezed out. The only problem is how the red caps snap open. It's good that the bottle doesn't spill, but you have to use your fingernails to pry off the cap, and when it comes off it usually leaves paint on your fingers. I would have preferred a longer cap with a friction fit (like seal hoses).
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