Abstract: A method especially useful for marking property having a multitude of individually-valuable metal components involves adhering at least one specially-constructed label to at least one painted metal surface of the property to be marked. Each label includes a thermal label stock layer having information relating to the marked property imprinted on one side and a non-release thermal adhesive layer coated on another side. The label is impregnated with a chemical which is visible only when exposed to ultraviolet light and has apertures therethrough forming identifying indicia at a predetermined location, such as a personal identification number unique to the property owner, and/or a bar code imprinted thereon containing the identifying indicia. A durable topcoat on the label provides a protective seal. After the label is adhered to the metal surface, the ultraviolet-visible chemical migrates to substrata thereof.