Quote Originally Posted by Silver Creek View Post
The test for how well a product repels water is to measure the contact angle of a water droplet on the surface. http://en.wikipedia.org/wiki/Superhydrophobe
I think this is what you are talking about, according to this information the attack angle for Neverwet is 165-170 degrees, RainX is the next best product they show result for at 110 degrees. http://www.neverwet.com/product-characteristics.php