Cast iron is a strong and malleable black material made from an alloy of iron, carbon and silicon. Cast-iron fences can rust due to oxidation from the environment and humidity, causing deterioration and an unattractive appearance. With the proper technique, you can clean, prime and paint a rusted cast-iron fence to restore its appearance and prevent future oxidation. Use paint and primer designed specifically for metal for the best results.
Remove rust from the ironwork. For small rust spots, use a handheld rotary tool fitted with either a stainless steel or abrasive brush accessory. For mid-sized rust patches, fit an aluminum oxide grinding wheel accessory to your rotary tool instead. For large rust removal jobs, use a power sander.
Dampen a cloth with mineral spirits and wipe the fence to remove as much debris as possible.
Paint the cast-iron fence with a rusty-metal primer. Use smooth strokes with a paintbrush and cover the iron thoroughly. Allow the primer to dry completely.
Paint the cast-iron fence with two coats of metal paint. Use thin, even coats. Allow the paint to dry completely before applying the second coat. If you use spray paint, it may take up to four coats for full coverage.
Tips & Warnings
- Always wear safety goggles and a respirator mask when using a power sander to remove rust from ironwork.
Things You'll Need:
- Handheld rotary tool with a stainless steel or abrasive brush and aluminum oxide grinding wheel accessories
- Power sander (optional)
- Mineral spirits
- Rusty-metal primer
- Metal paint
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