A new and distinct cultivar of Agastache plant named \u2018After Eight\u2019, characterized by its upright, mounded and compact plant habit; freely flowering habit with numerous spikes per plant and numerous flowers per spike; and violet blue-colored flowers. Also described are the resulting conversion-coated magnesium-containing surface, as well as mechanical components and devices containing the conversion-coated magnesium-containing surface. One embodiment provides a high-level script language to automate some sub-tasks and to guide the search for a simpler the configuration that reproduces the problem.