Australians liked a solid steel roof. The cheapest cars were always the soft top tourers. People remembered the 1920's cars with canvas in the centre of the roof that always ended up leaking. That's why the decouvrable didn't sell. Australian advertisements never made the sunroof a selling point and road testers usually ignored it. When the drain holes were kept free and the roof firmly closed I've found it doesn't leak but most sun roof cars had some water staining on the headlining. The sliding steel sunroof was a Peugeot feature from before the war. I'm certainly glad I've got a sunroof car.