Yes they do a clear coat that just keeps the heat out and protects the interior, dash and leather from the sun without obstructing the view.....I live in the desert
Interesting, I’ve never heard of that.
Ceramic coating is essentially a micro layer of glass, and putting glass on top of glass doesn’t seem wise in general. There are films that protect windshields, there are also hydrophobic and super-hydrophobic coatings that are used, but I didn’t know ceramic on glass is a thing, I’m not even sure how it would help with sun and heat reduction. So I learned something today.
That said, I have no idea why it would make any difference on how water collects at the bottom, gravity is the decider on that one.