In order to deal with the rust along the bottom of
the door, I suspended the entire door from the
rafters of my garage, so that it hung loosely in a
section of a plastic rain gutter. The end caps used
rubber seals, and I glued them on for added
protection. I also drilled a hole in the bottom of
the gutter and plugged it with a rubber stopper.
The gutter arrangement made it possible to treat the bottom of the door with various liquids. I started with concentrated muriatic acid (30% HCl) for 15 minutes. After the acid treatment, I drained the HCl via the rubber stopper, and rinsed with normal water. I drained the water and rinsed with water and baking soda, to neutralize the acid. Then I repeated the whole process, which effectively killed the rust near the bottom of the door.
The gutter arrangement made it possible to treat the bottom of the door with various liquids. I started with concentrated muriatic acid (30% HCl) for 15 minutes. After the acid treatment, I drained the HCl via the rubber stopper, and rinsed with normal water. I drained the water and rinsed with water and baking soda, to neutralize the acid. Then I repeated the whole process, which effectively killed the rust near the bottom of the door.
