Acrylics over Oil?

[Uli]

I'm in the middle of a series of mixed media experiments, mostly combining acrylics with other media.
(Here are some results http://www.conceptart.org/forums/showthread.php?p=2109888#post2109888)

Yesterday I used acrylics with water soluble oil colour. I did a wash (word?) and the dark areas with acrylics, then applied oils. I waited some hours and felt that I would like to paint in the details with acrylics, which makes a thinner line. Usually the rule says "fat colours over lean" (word?), so I was wondering if someone ever tried such a thing. How long would I have to wait for the oils to dry? I believe that dry oil colour is considered less fat. I was equally wondering about doing acrylic glazing over oils.

[Jem'ennuie]

You can try it but most will tell you it's not a good idea.

Oil is..oil based..and oil floats on top of water. Since acrylis is water based you still have a chance of the oils mixing with the water and the oils will come floating up.

You're going to let it dry but then you have a different problem. The acrylis needs something to adhere on, and oil is the last thing you want to use as a base for acrylis heh.

I've never tried it no, but don't try it on your best work heh.

[Elwell]

Almost everyone will tell you it's not recommended. The danger is long-term lack of adhesion between the layers. I've done it once or twice for deadline reasons on illustrations, and the acrylic sticks to dried oil paint fine, but I wouldn't do it on anything of potentially lasting value. You can get the same thinness of line and degree of detail with straight oils (although probably not with water mixables if you're thinning with water).

[Not Pink]

Oil is..oil based..and oil floats on top of water. Since acrylis is water based you still have a chance of the oils mixing with the water and the oils will come floating up.

I myself don't know much about it either but I did want to point this out to Jem'ennuie and Elwell to see if maybe they have better responses?:
Yesterday I used acrylics with water soluble oil colour.

[Uli]

Thank you everybody.
Elwell-- I'm warned. I didn't realize that there were adhesion problems with dry oil colour too. I though the problem was mainly cracking.

I'd be interesting in hearing from everyone who has combined acrylics and water soluble oil colours in general, about how they mixed etc.

[Elwell]

Not Pink:
Once water mixable oils are dry, there's no difference between how they behave and traditional oil colors.

[Uli]

Ah, I wasn't sure about that, Elwell. Thanks again!