Why you would want to do acrylic over oil:  Frazetta would do under-paintings in oil.   Oil under-painting can be done in one color only.  Not burnt umber paint and white but just burnt umber only.   You can draw white lines with the handle of the brush you can wipe off white areas with a rag and just keep working that way till the under-painting is perfect.  Being able to draw white lines with no paint whatsoever is a huge advantage when doing under-painting.    Plus the under-painting looks gorgeous by itself.   It occurs to me why not use acrylic on an oil painted whiteboard?  Or you could do masking with acrylic paint if it comes off so easily.   You could also do scratch-board techniques.   And if that doesn't work then maybe you can do acrylic over oil.  I wonder if it would make interesting textures.   Maybe there's a clear gesso you could apply to an oil underpainting.  It would be nice to be able to do a nice oil underpainting.

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