I got into the habit of using Neocolor II pastel/crayons as the underpaintings for my acrylic on canvas; it only recently occurred to me that these contain some wax and may not be wise for the integrity of the acrylic. Granted I am using them activated so they have basically become paint, but I’m not sure if this makes a difference. Please advise.
Since they are water soluble, I would think that you are safe. The problem would be bleeding but if that has not bothered you that is no problem. I worry most about the colors not being lightfast but if you are completely covering them this is not really an issue either.
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