Parkers Enterprises repairs a wide variety of vanity tops— cultured marble, enameled or porcelain-coated steel drop-ins and composite. Before repairs are made, it is important to determine what type of sink you have. Types of Vanity Tops Cultured Marble Vanity Tops Cultured marble vanity tops are usually an integrated bowl and backsplash. Enameled or Porcelain-Coated Steel Drop-Ins Enameled or procelain-coated steel drop-ins are precast bowls designed to drop into a laminate or solid surface vanity top. Composite Drop-Ins Composite drop-ins are usually a one-piece, injection-molded bowl.