Drill race resistance welding. Clean the mating surfaces with a grinder. Apply a zinc-containing primer to the surfaces to be welded by contact welding. Fit the new wing and install it, providing the required clearances. Weld the wing by resistance welding along the perimeter and weld by arc welding in a protective environment holes at the junction of the wing panel and racks (front and back) side window opening (back door). Apply sealant and restore the protective coating of the rear wheel arch. Treat the internal cavities with liquid wax.
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