When it comes to primers, I'm not gonna lie, I don't always use them... The main purpose of a primer, is to shrink pore size, add another barrier between your makeup and your, and to help the makeup you apply last longer. Because I don't find myself applying a full face of makeup everyday, I don't always feel the need to prime, after I apply all my morning creams and tone my face... But I absolutely recommend priming when you plan on applying full coverage, especially if you're going to need it to last for awhile. Below I have my personal favorites to use, and I even sometimes mix and match them!