Preserving the front door

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Protect the weld seam from corrosion with the cavity sealant.
The Inner door panel Is welded with the door outer skin In the area (1).

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: To provide a better overview: Schematic diagram with partially hidden components.
Preserve the laser weld seam (1) between the Inner door panel and the door outer skin.
Apply cavity sealant from the Inner all around. Remove any cavity sealant which emerges.

Courtesy of BMW OF NORTH AMERICA, INC.