Since I have another one of those bowl already in use at another location, I can definitely confirm a very good weather resistance. So far, only the paint is a less splintered, but not from.
As the bowl is made of aluminum, rust nothing.
Due to the still very small mirror size but remain little bad weather reserves (Astra 19.2 °, 0.2 dB-twin LNB).
Therefore, I recommend - if possible - to attach the 45cm version, which I have now even in use.