Craft paints don't have as much pigment in them because they are kept at a low price point. The pigment is what drives the price up. The more pigment you have in a paint the better for coverage. Artist acrylic paints cost more but have more pigment in them. Have a look at this article.
https://thebluebottletree.com/painting-polymer-clay/
By Gordius on Apr 11, 2020, 11:38 AM
Thank you for the link. It appears I have quite a bit of experimenting to do.