A gilded weathercock is weatherproof!
Gold leaf and gilded surfaces are also very durable outdoors. The best evidence of the durability of gilding is the weathercock on a church tower. It turns in and with the wind, and unlike its counterparts on the farm, it of course has no shelter, so it is truly at the mercy of all winds and weathers.
The prerequisites for a golden weathercock to have a long life on the rooftop are professional and meticulous preparation of the subsurface, corrosion protection and lacquer formation on the metal surfaces.
Finally, a topcoat must never be applied to the gilded surface. The gold leaf alone defies the weather burdens over many years, whereas a topcoat would peel off and flake off after a short time due to adhesion problems.