Board enhancer or snake oil? http://www.surfnanoproducts.com/index.htm
From the product description page:
Surf Nano Products, LLC announces the launch of a revolutionary product for the water and snow sports industry. The “Board Enhancer” is a clear, hydrophobic coating that when applied to the underside and rails of a surfboard and allowed to cure, creates a water repellent surface which reduces drag, increases board speed, and increases quickness in the turns. It is not a wax, silicone, or teflon based product as is the competition. The product is actually comprised of milllions of glass and ceramic particles that are molecularly bonded to the surface through an evaporating ethanol carrier solution during the one hour air curing process. The result is an ultra-thin, non-stick coating that is 30 nanometers thick, and for some perspective, one human hair is 10,000 nanometers thick. Its UV resistant feature reduces board discoloration.
Form the second paragraph:
The product, manufactured in Germany, was originally developed for glass windshields...
Sounds like RainX!