La Petite Robe Noire by Guerlain has created Lip & Shine, a smart product that lets you switch up your lipstick finish in a flash for an incredibly shiny result. Lip & Shine: one product, two uses. 1) Hydrating base for lips: use as a base to leave lips supple and comfortable before applying your favourite lipstick. 2) Top coat for lips: for an ultra-shiny result, Lip & Shine can be used as a top coat to add a twist to your lipstick finish in a single stroke.