Only fully galvanised bodies offer optimum
corrosion protection. This is the key to Audi’s 12-year warranty against rust perforation. The floor pan, frame elements and internal elements not normally visible are partially hot-galvanised. The visible outer panels and other elements, however – roof, sides, doors and filler flap, for instance – have a particularly fine galvanised surface. Both types of sheet-metal components are galvanised before delivery to the factory. The zinc coating also adds stiffness to the sheet metal
See also:
build quality and
body stiffness