Ever been looking for that perfect shade of eyeliner and simply unable to find it? Eyeshadow comes in a veritable rainbow of colors, but often, the liner to pair with it is limited to blacks, browns, and dark shades of navy and plum. And where’s the fun in that? A few brands offer more options, but what if you want something that’s really high-quality and long-wearing as well?

There’s the old dunk-the-eyeliner-brush-in-water trick that allows you to use any of your eye shadows as impromptu liners, but that usually doesn’t give you much staying power over the course of an average day. Enter Illamasqua Sealing Gel.

Instead of dunking your brush in water, dunk it in this genius little bottle of gel and it turns any of your eye shadows (and let’s face it, you’ve got a lot of them) into a waterproof liquid liner. Genius. And for $12 for two bottles, this isn’t a want – it’s a NEED.

Sephora, $12.