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How to Repair a Rusted Metal Roof
- 1). Scrub the affected portion of the roof with a wire brush to clear away dirt, moss, old paint, flaking roof cement and loose rust. Remove stubborn debris with a metal scraper.
- 2). Rinse the metal surface with water to wash away the loosened debris. Dry the metal with paper towels.
- 3). Apply naval jelly to the rust as instructed by the product manufacturer. Wear heavy-duty gloves and safety glasses for protection from the chemicals. Leave the naval jelly on the roof for 30 minutes to dissolve the rust.
- 4). Flush the metal with water to wash away the naval jelly. Wipe the metal with paper towels until dry.
- 5). Examine the metal surface for remaining rust. If some reddish-brown patches persist, rub 80-grit sandpaper diagonally over the metal surface until the rust is completely removed. Follow up with 120-grit sandpaper to smooth the metal surface.
- 6). Saturate a clean rag with mineral spirits. Wipe the saturated rag over the metal to prepare the metal surface for paint. Allow the metal to air dry.
- 7). Rinse and dry the metal surface. Make sure it is completely free of rust, dirt, oil and any debris.
- 8). Apply one coat of rust-resistant primer to the metal surface using a roller brush. Allow the primer to air dry for the amount of time advised by the manufacturer.
- 9). Distribute two coats of acrylic paint over the primer. Let the acrylic paint to air dry according to the instructions printed on the can's label.
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