I've pretty much mastered my eyebrow routine by now, but I've never quite figured out how to keep my eyebrow makeup from smudging during hot, sticky summer months. Well, that's until I watched Beyonce's longtime makeup artist Sir John spill the tea on his sweat-proof eyebrow secret during a YouTube tutorial with Makeup Shayla. Believe it or not, Sir John keeps a tube of wig glue in his makeup bag.