Why use a water mixable oil? A water mixable oil is the easiest painting medium to work with. It stays wet and workable for several hours which means you have time to blend, play with your colour, fix mistakes and make changes as you go! Many years ago, traditional oil paints got a bad rap because of the use of turpentine and solvents, however, with the water mixable oil there are NO toxic solvents and the odour is gone. They are the easiest medium to learn in and have incredible results with just a few basic techniques.