a device for coating materials is provided . the device includes two opposing discs connected by a central hub . each disc includes an inwardly extending flange about its perimeter . the central hub has an exterior surface defining a v - shaped surface . when assembled in a coating apparatus , a fluid material , such as batter , may be dispensed toward the exterior surface of the hub while the disc is spinning . the resulting spray of fluid may be used to coat material effectively , while minimizing waste .