Rain-X is a product used to make your windshield repel water. It's about $8 for a few ounces and can be purchased on Amazon. I have always appreciated the water repellency that Rain-X offered my windshield. It does not boast diamond-like hardness like ceramic coatings, but it still works great to help visibility during heavy rainstorms. So, I decided to peak under the hood and determine how complex this chemistry is. In this short article I will walk you through its pre