No manicure is complete without a shiny finishing layer to seal the deal—and the best topcoat nail polishes do exactly that. “It’s essential because it seals and protects the nail color or design, adds shine, and helps extend the wear of the manicure by preventing chipping and fading,” says celebrity nail artist Erica De Los Santos. In addition to keeping your favorite polish from chipping, a single swipe of one of these formulas can intensify color and deliver the high-definition gloss (or velvety matte finish if that’s what you prefer) that takes a DIY mani to the next level.