A method for isolating microstructural regions or features on a surface for electrochemical experimentation comprising polishing a metal sample, coating the metal sample with a photoresist, selecting a region of interest of the metal sample, exposing the region of interest with light energy, developing the exposed photoresist and creating a developed region. A longitudinally moveable member extends through a slot in the hub and radially into the bore. A special bracket attaches to the top of the item, where it can be left unpainted, and the whole clips into a slot in the swivel. A dispersion in which an inorganic powder subjected to a water-repellent organic surface treatment is uniformly dispersed in water, wherein the contents of a water-repellent inorganic powder, a dispersant, and water is 80% by weight or more based on the total amount of the dispersion.