Once Fertan Rust Converter is done converting rust into an inert dust, what is the next step?

Once the conversion process has produced an inert black dust, you simply need to either wipe with a damp sponge or rinse gently with water to clean the surface. What will be left is a black Zinc Phosphate coating that will adhere to the bare ferrous metal. This black Zinc Phosphate coating will protect the newly treated surface for up to six months before needing to be primed/painted or covered in a wax or light oil to prevent further rusting.

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