Coating compositions and method for improving the properties of coated substrates

摘要

An acidic aqueous coating composition comprising dissolved phosphate, dissolved aluminum, dissolved dichromate, inorganic colloidal particles and a water miscible organic component including an effective film-forming amount of a water miscible material comprising an ether of a polypropylene glycol, and preferably including also another glycol material, for example, a mono-ethylene glycol material or a monopropylene glycol material, for use as a glaze coating, or as a base coating which includes also a particulate material.