While sanding the rust from the surface of the metal the rust damage will be exposed and there is a chance that the rust hole you need to repair will grow larger.
How to repair sheet metal door rust.
The welding process actually adds new steel to the thin steel and can result in a repaired spot that is stronger than the original metal.
Leave the rusted area exposed.
Thanks to modern chemistry and manufacturing we now have two part epoxy panel adhesives that are strong and flexible enough to bond metals together more or less permanently.
I had a major rust problem in my 1989 mitsubishi montero ls v 6 four door and thought giving glue a chance would at worst demonstrate what not to do and at best bond some new steel in place of rust with a minimum of body filler.
The area should be sanded until it.
Pull the trigger of the angle grinder and run the spinning 60 grit flapper wheel over the rusted area of the metal.
Cover the surrounding metal with masking paper and tape.
How to repair rusted metal without welding.
The complexity of welding increases as the thickness of the material decreases.
Specially formulated metal primers are designed to help prevent future.
Apply metal paint primer to your door with a paint roller for the larger areas and a paintbrush for crevices and grooves.
Cut some sheets of masking paper to size with a sharp pair of scissors.
Press them flat against the surface of the metal then secure the edges with masking tape.