Acrylics over oils? Oh my......No! I just read somewhere on the wonderful wacky web that it would be fine...well....No. But you can use shellac or shellac based primer over the oil based and then acrylic over that and the world will stay in one nice piece much longer. Oil and water don't stick together well. Oil paint oxidizes and sorta keeps doing that for who knows how long. If you put water based paint (unless magically formulated- as some are) it will soon come off the oil.
If you're painting on canvas, forget the shellac. Too brittle. Just stick stay with oils. It's more fun anyway.
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