How To Stop Rust On Car Door. How to fix rust at bottom of car door rub an abrasive scouring pad over the rust spots. Spray a generous coating of rust neutralizer on the rusted area of the door.
.jpg)
Wipe a thin layer of rust converter onto the metal and wait 15 to 30 minutes for it to dry. You should also clear away any water which collects at the drain holes on door bottoms and rocker panels since these are prime areas for water buildup. This is a product that can prevent the development of new rust.

