One step further back, in preparation for the actual welding work, which sometimes takes up to 800 hours per vehicle: Cathodic dip coating of the stripped sheet metal does not always come into its own either, and for one particular reason: Air bubbles can form with this method – and where they do, bare sheet metal is not protected against corrosion. In addition, it has been shown time and again during restorations of the classic F model that spray sealant has always been used generously in the area of the partition between the passenger compartment and the engine compartment. This is removed by the water jet under high pressure almost as if by itself.” The exposed sheet metal allows a very precise assessment of any previous damage on the straightening bench.