Dear all !
There are water solulable oil paints out there, too. Most oil brands produce them.
Check them out.
Oil solulable Oils:
I take a piece of toilet paper (cleanex, paper..) and put the oil paint on it to get rid of the oil;
I dilute the oil with petrol (and enamels , too) that you buy for cigarette lighters.
It evaporates fast, the oils dry faster (and matted enamels look really matt- take a toothpick
to get the paint out of the tin can and thin it with the petrol ).
Gunther