I recently started painting in oils. Right now I'm just putting the paint on straight, with a bit of liquin when I need it to spread better. Liquin seems to work fine in that respect, but doesn't really add to the "quality" of the paint, if that makes any sense. I plan on playing around with turp, linseed oil, and varnish when I get some time, but I was wondering if people wouldn't mind posting their favorite mediums or combination of mediums, and why. Also, does anyone use different mediums for different stages of their paintings? I.E. do the underpainting with turp, and then switch to something else for the rest? Any advice would be appreciated.