There's a time and a place for everything . . . and that includes smudging. A little extra mascara under your lower lashes is perfectly fine with a smoky eye, but if you're only applying that product, it can look unintentionally sloppy. When Sugar staffer Angelica complained that even waterproof mascara smeared under her otherwise bare eyes, I recommended using minerals to lock that in.
Similar to applying powder after a liquid foundation to lock a look, mineral-based powders can be used to stop runny mascara. After applying mascara, take a flat applicator (like Studio Basics Dual-Tip) and dip into a mineral eyeshadow. Lightly run the shadow-covered side across the tips of lower lashes. Because not everyone uses this kind of shadow, I tested it with my mineral foundation. Even though I worried my lashes would look noticeably light at the ends, there wasn't anything out of the ordinary (like smears). Dip, tap, blink, toss, and you're ready to go!