Repair a shipping container door seal by first proving where the seal has failed, then replacing the damaged gasket section or complete gasket with a profile and attachment method approved for that door. Clean and prepare the retainer, form watertight corners as specified, and verify even compression after the door is aligned. Caulk smeared over a torn or hardened gasket is not a durable substitute.
Confirm the door-seal leak before removing rubber
Match the container gasket profile and retainer
Decide between a local section and a full perimeter
Prepare the retainer without creating a second defect
Compression must be even around the whole frame
When professional repair is the safer choice
Match the replacement seal to the door
Include full-door photos, close-ups of the failed run and corners, container identification, leak location and whether the frame or hinges are damaged. Ask for the gasket profile and verification method in the scope.

