Painting oil over acrylic

Thank-you all very much for replying, really interesting and useful to know that these paints dry out in the tubes, and the paint also dries with a sheen, which you mightn't want. Something that isn't mentioned in the advertising of course. Rules them out for me. I think that I'll be sticking to acrylics after all.

Well,  yes; understood.  But - could I suggest you don't be too quick to rule things out?  You could miss out on a whole world of experience if you do.  I would rather use regular oils over water-miscibles, and over alkyds - the reasons are innumerable.  I would hate to have to give up acrylics: they offer a completely different experience, and incidentally - I don't follow at all the claim of some YouTube artists that you can make acrylics look just like oils: actually, you can: but WHY?  They're not a cheap substitute, a way of tricking the eye into thinking they're just the same..... they're NOT the same, and I really get hopping mad when people claim they're good because they can look 'just like oils'.  NO - no, no, thrice no,  quadruple no ....  I don't want my acrylics to look like my oils, any  more than I want my oils to look like gouache or watercolour.... why do some people have so much difficulty in valuing the unique qualities of a medium and seek to make it conform to others? There, you see - you've made me cross now..... though of course, it's not in the least little bit your fault.  And it's not even anything  to do with anything you've said.  It's just that I like to vent now and then.  Point is - of course we have to choose our media - few of us are married to oil barons or Geoff Bezos, so our resources are limited and we have to choose between accessible ranges.  Try 'em all, though, if you can; or as many as you can.  At least dip into as many as you can - somewhere out there lies Shangri-La - whoops,  I mean, your unique individual medium.  Keep trying  to find it; but if you think you have - well you're lucky  - indulge and enjoy.  

Clumsy double post.

Wise words.  I’ve tried most mediums, quickly realising that some weren’t for me. Oil pastels for one.  Oils are the king of mediums for me, but I’ve never really taken to them.  In my present state they are a forlorn hope.  My clumsy impatience takes all the joy out of using them.  Woodcuts and linocuts, for which I have great admiration, have eluded me too.  These days I can’t spare the blood. So it’s the lordly pencil for me, in all its forms.

Really enjoyed your post Robert, and quite agree that acrylic isn't oil (or watercolour). Have tried a number of different mediums, will probably limit myself at present, although I still think I'll see how my friend uses her Cobra water miscibles (don't think I've ever asked her why, either. She must have had a reason other than the clean up.) Lewis, no need to put yourself at risk of blood loss, you're the lord of the lordly pencil.