I'm working on a new painting and prepared the canvas with several thin layers of acrylic paint to create a solid black background which I then let dry for a couple of days. I then began painting over it with oils. Five days after applying the acrylic layer, I was removing a bit of the oil paint using oil of spike lavender which quite unexpectedly also removed much of the underlying acrylic paint. The acrylic layer is now a bit tacky in that spot and some of the oil paint has gotten mixed into it.
Can I safely continue to paint/mix the oil paint over and into this acrylic/oil combo? Or should I do my best to scrape off all the paint from the compromised area before painting over it?
I know you can't paint acrylics over oils as the acrylic layer will crack and you can't mix them due to the evaporation vs polymerization mechanisms of the different paints, but technically the acrylic paint was dry. The solvent caused it to break down, but there should be a negligible amount of actual water in the paint itself. Since the acrylic paints (when dry) seem to just be polymerized -acrylates and "dry" oil paints are polymerized fatty acids, would mixing a water-free acrylic paint with oil paints using a non-water solvent be roughly equivalent to (somehow) mixing cured oil paint with wet oils?
And moreover, will this lead to excessive cracking?