Reflective paint and a method for its use

A highly reflective coating painting product, particularly suitable as a coating for integrating spheres, comprises a diffusely reflective product such as, for example, barium sulphate, and an acrylic binder or glue, Which are dispersed in a liquid vehicle, preferably constituted by a mixture of Water and alcohol. The acrylic binder or glue is a product based on acrylic polymer or copolymer the quantity of Which in the coating product is between about 1% and 15%, and preferably between 3% and 4%, by Weight, relative to the reflective product. The coating product is applied to a surface in successive layers until a thickness of at least 0.5 mm is reached.The surface coated With the product is then subjected to heating, preferably at about 100° C., for about 1 hour.