i have painted for a living for many years now. i have used as many different types of paint/substrate combinations as you can probably think of, and i have encountered problems like this one on many different occasions. the only thing that i can attribute to it is a reaction between the oils and reducers in the paint and the different types of plastic/styrene. water-based paints will do the same thing if you paint a non-porous material (plastic, metal, etc.) and a porous material(wood, paper, etc.). liquitex is a very good paint, and it is very stable. i'd say that was a very good choice to go with.
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