Paint Rusted Metal Using Phosphoric Acid or the Rust Will Reappear quickly

Metal seawalls can be treated for rust using phosphoric acid. Phosphoric acid is a non-flammable, water-soluble liquid that reacts with rust to form a protective layer of iron phosphate. This layer inhibits further corrosion and can help to extend the life of the seawall.
To use phosphoric acid to treat rust on a metal seawall, you will need to:
Clean the seawall surface to remove any dirt, debris, or loose paint.
Apply a thin coat of phosphoric acid to the rusted area using a brush or roller.
Allow the phosphoric acid to react until it is dry.
Rinse the treated area with water to remove any residual phosphoric acid.
Apply a primer and topcoat to the treated area to protect it from further corrosion.
It is important to wear gloves and eye protection when working with phosphoric acid. Phosphoric acid can irritate the skin and eyes, and it can also be harmful if inhaled.
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