Guerlain makes some of the most luxurious beauty products out there, and this makeup primer is certainly no exception. The Guerlain L'Or Radiance Concentrate with Pure Gold is a "24-carat gold-infused cooling gel that sinks into the skin, retaining moisture." For me, it's as much as skincare as it is an excellent makeup primer. I highly recommend this if you don't mind spending big bucks for a serum and primer in one bottle.
Personally, I don't like relying on primers to make my makeup stay put. I prefer investing in good makeup with dependable lasting power, since I don't have the luxury of adding one more step in my routine on most days. However, when I need my makeup to look good for more than six hours at a time, it becomes a necessity to use a primer.