N.Y. General City Law § 67

§ 67. Patent plasters. When patent plasters, such as ivory, acme,\nwindsor, et cetera, are used, lathing, if of wood lath, shall not be\nless than one-quarter inch key space. First coat shall be thoroughly\nscratched to make key to retain second coat, and shall be set before\nsecond coat is applied.\n