i tried using regular poster paint (the tube ones) as ink for my dip pen. it took me a while to realize that it had to be really thinned down before i could get it to write. but one issue i had was that the ink wouldn't hold for very long. i could only make a few strokes, and i had to dip again (considering i was using a zebra g nib which really holds a lot of ink). there were instances wherein the ink would just slide off the nib and make blobs on my paper.
I had a similar experience with poster paint - when it dries, it seems that it cracks or has some powdery finish on the paper. I since switched to acrylic and watercolor because the pigments remain intact. With watercolor (and gouache), you can add a drop or two of gum arabic. Or, dip the nib in the gum arabic and blot off excess before dipping into your mixed ink. This would get the nib "going" better.
You can also try another nib. There are some inks that just refuse to hold on to the Zebra G for some reason.
Hope this helps!
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