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Err on the side of caution
Sandy,
If I were you, I would be very careful about putting traditional oil paint over a plastic foundation. The layers in a painting need to meld together into a unified paint film. Thus, the fat over lean rule.
One of our selling points as portrait artist is the archival integrity of the works we create. How can you guarantee that which is essentially an experiment?
You also made a comment about the lack of Genesis paints' fumes. Just because you can't smell something it doesn't mean it's not there. Fact: plastic, whether wet or cured, releases formaldehyde. This includes all forms of acrylic paint. To then expose the paint to high concentrations of heat would seem to exacerbate the release of these fumes.
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