My face will use any excuse to turn my T-zone into an oil slick, although admittedly it’s much better than it used to be (see notes on dehydration below). The hot weather only makes it worse but as it’s a problem I’ve struggled with for most of my life, I’ve learned a few tips and tricks along the way that definitely help to stop your makeup sliding off your face. Using the right products at every step of the process can make a huge difference to the longevity of your face makeup, and I’ve found that the most effective strategy…