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Finally, the two front fenders were blasted to bare metal. After blasting is complete, it's wise to coat all exposed metal with a good etching primer. If the body is to sit for any extended length of time, a good sealer is recommended, as well, to prevent any further deterioration of the surface. While bare metal can actually sit exposed and not immediately begin to rust, chances are the car will be moved, and the acid from your very hands will initiate the rusting process faster than you think!