Many of you, who are familiar with oil painting, probably know what oiling-out is. But for those of you who don't: Oiling-out is the process of covering your dried painting surface with an oil mixture before beginning to paint. This mixture is usually a combination between oil and turp.
When oil paint dries between sessions, it has a dry and dead appearance to it. In order to gain the vitality and shine back, oiling-out is crucial. The other beauty of oiling-out, which I wish I had learned earlier, is that oiling-out allows you to cover the surface MUCH more easily.
If you're starting with a full palette, ebauche, then oiling out is going to help you out.
Below: I have attached two unfinished Bouguereau paintings, left in a state just after the initial ebauche. Notice how his brush marks surrounding the figures don't appear to be encumbered in any way. If you try painting a rubbed ebauche without oiling-out then you will have a much fuzzier effect, which comes in handy in some landscape painting. Oiling painting and its various techniques continue to amaze me.
-Breathe new life into your dried paintings between painting sessions, try oiling-out-