How to Fix a Metal Door That Has Rusted Out at the Bottom

Take the metal door off the hinges using pliers to pull out the pins and/or a screw gun to unfasten the hinges. Set the door on a table or workbench in a well-ventilated area.

Put on safety glasses and use a grinder to knock off the loose rust, grinding down to the bare metal. Exercise caution when using the grinder, always keeping a firm grip and never touching the grinding pad.

Wipe the metal door down with damp rags to remove the dust and allow it to air dry.

Open a cold weld kit and mix equal parts of the liquid steel with hardener in a mixing bowl, then stir together with a spatula.

Apply the cold weld mixture to the bottom of the metal door where the rust was present using the spatula, then let dry as long as directed by the manufacturer.

Apply a coat of metal primer using a paintbrush, let dry for three to four hours, then paint the metal door with a matching color paint and allow to dry completely before rehanging it.