Well I've tried to get it working with very thin paint but it just won't flow. I used water, a medium airbrush and even added a little alcohol to the water but it just doesn't flow. Big hole grips might work, but right now I don't want to risk money. I could try again with oil paint and thin it with turpentine but I got this specifically for use with acrylic paints and am disappointed. Ok to be fair and honest it worked when I added the ink in there so I tried the acrylic again with the same disappointing result. So this is my impression of the pen, hope it helps.
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