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“Best" is a subjective term and so there is not one best answer. Your choice of surface coating depends on what, where, and why you want to reduce surface friction. For aerospace applications, Tungsten Disulfide (WS2), Molybdenum Disulfide (MoS2), and various forms of Teflon are all used to reduce surface friction on a variety of surfaces including paint. For more information about surface friction check out the How Things Fly Website at https://howthingsfly.si.edu/aerodynamics/pressure-drag.