CND Shellac Original Gel Top Coat. Size .25 oz/7.3 ml. A single layer of Shellac Top Coat provides the durable, final coat and seals the deal with a mirror-like finish. Formaldehyde, Toluene and DBP (Phthalate) FREE. Check out the other types of CND Shellac Top Coat too, such as Duraforce, Xpress and etc.