Spray these coatings on glass to create a clear, scratch-resistant surface that repels oil and water. They’re also known as oleophobic and hydrophobic coatings. Good for use on machine windows to repel coolant for a clear view, they can also be used on exterior windows to help keep them clean. Coatings are made from nanoparticles of fumed silica, also known as quartz, suspended in a solvent. Spray them onto glass, fiberglass, and ceramic surfaces and spread with a cloth. Allow to dry overnight and buff for a thin, glass-like finish that protects against chemicals, such as acids, alkalies, coolant, fuel, and solvents.