Ever since corrugated metal has come indoors as a design element, a touch of rust may add character to the Shabby Chic style or country theme in a home. If you cannot wait until the weather rusts your corrugated metal through exposure, it's pretty simple to speed the process -- as long as the metal contains iron, tin or iron alloys. Wear protective gloves when working with corrugated metal to avoid cuts.
Hydrogen Peroxide and Salt
Work in a well-ventilated area to avoid inhaling fumes. Put on safety goggles and gloves.
Fill a bucket with water and add enough liquid degreasing dishwasher detergent to create suds.
Clean the corrugated metal with the solution to remove all dirt, grease or grime. Rinse it clean and wipe it dry or let it air dry. Use a wire brush that can scratch up the surface of new corrugated metal to help it rust better.
Pour a generous portion of hydrogen peroxide into the spray bottle.
Spray the cleaned corrugated metal with the peroxide as it lays on a flat surface.
Sprinkle the table salt on the metal while the hydrogen peroxide is wet. Cover the hydrogen peroxide with a thin coat of salt so it interacts with the hydrogen peroxide. As you sprinkle the salt, you can see it begin to work with the hydrogen peroxide.
Rub the item with a rag to remove the salt after it has dried. Repeat Step 4 through 6 until you achieve the rusted look you want.
Apply a sealing coat if you don't want the rust to rub off, such as a polyurethane or acrylic spray.
White Vinegar and Bleach
Mix 1 part of vinegar to 2 parts of bleach in a bucket.
Pour or spray the solution onto the corrugated metal.
Let the corrugated metal air dry. Wipe off excess rust if desired.
Spray the item with an acrylic high-gloss or matte sealer based on your preferences.