I thought that too. With the weather in PA is has taken me this long to do a test. I removed the Fuzon, and applied a coat of SSII. The next time it rained, I did NOT have water marks. What I am doing today is doing a thorough cleaning, and I am putting SSII on one half of the car and Fuzon on the other. It is supposed to rain tonight so I will see if what happens. If there are watermarks on the Fuzon side, there is something defective in the batch I got.