How water proof are sunroofs

They are designed to leak water and the moat and drains (if clear) carry water away.

We had problems initially with our 2018 Tiguan however a high pollen year and then a service program came around to fix the issue and it worked.

Since age 16 in 1986 I have always had a moonroof and no leaks except above.
 
As I said, it comes down to semantics. The word leak has a negative connotation and that's why I would not want to use the term unless we talk about water ingress that overwhelms the drainage system. I wouldn't say a tire has a leak if it loses 1 psi over the course of a month.
Good point .
 
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