- 1). Remove all paint, dirt and debris from the wrought iron surface with the stiff wire brush. If corrosion is deep and there are many layers of paint and rust, you may have to use a pressure washer or sandblaster. Whichever system you choose, pay particular attention to corners and joints where moisture tends to collect, or areas where pieces have been welded with lead or steel.
- 2). Repair any broken joints or pieces with a drill and iron screws. Do not use steel screws, because steel and iron are incompatible and prone to corroding quickly when used together.
- 3). Spray the wrought iron with water to remove any particles of grit that remain. Allow the surface to air dry completely, especially in corners, curves and joints. Apply metal filler to surface blemishes and pockmarks to smooth them out.
- 4). Apply two coats of rust-inhibiting primer with a paintbrush to give the wrought iron a strong, protective coating for paint adhesion. Allow 6 to 8 hours between coats if humidity is lower than 50 percent. Allow 24 hours if humidity is higher.
- 5). Follow the primer with one coat of iron oxide paint or exterior enamel in the color you desire. Let it dry for 6 to 8 hours or until it is no longer sticky when you touch it with a finger.
- 6). Finish with two coats of exterior polyurethane in matte or high-gloss finish to protect the paint from moisture and weather. Allow 4 hours for drying between coats.
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