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Spray-On Invisible Thin Glass Coating That Sterilizes, Protects and Strengthens Surfaces Essay Preview: Spray-On Invisible Thin Glass Coating That Sterilizes, Protects and Strengthens Surfaces Report this essay This latest science invention is a spray-on invisible thin glass coating that sterilizes, protects and strengthens surfaces. The coating also repels water, dirt, stains, mildew, fungus, bacteria and.