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Bifold Door Seal Repair Bifold doors integrate door panels into concertinaed tracks to open and close an area. In time, these doors may have a few issues that require expert assistance. of regular maintenance could cause your bifold doors to swell up, which can lead to hardware problems and stuck doors. To prevent this from happening, you should lubricate your bifold doors every few weeks. Seals that are degrading As bifold doors are constantly exposed to elements