Have a hard time understanding when, how, or why to use all of the different Oil Mediums? Here is  a little information on Gamblin's Oil Mediums to help you out. 

Also, try Gamblin's Interactive Mediums Guide for suggestions on how to create and mix a painting medium that suits your specific needs by clicking the link below.
Choose the characteristics you desire in a medium from the drop down menus below and then click on the "Select" button. You will receive a recommend formula for mixing the proportion of painting mediums and drying oils that will achieve your intended effect.