A injection plug assembly for insertion internally into a walled structure to permit safe access to and wide distribution of a fluid, liquid or powder spray into that walled structure. The layer system is composed of a ceramic carrier and at least one functional layer to which a solvent is added. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH18GY through backcross conversion andor transformation, and to the maize seed, plant and plant part produced thereby. More than two pins are affixed to the anterior side and extend outward therefrom. The watermark may be verified by a user before operation of a secure application executed in the trusted security zone of the mobile device, and the watermark may also be present throughout the use of a secure application.