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What should you do if you see rust on a pipe?

Correct Incorrect Cleaning the rust can help prevent further corrosion, and if the rust is extensive or the pipe is damaged, replacing the pipe may be necessary. Using duct tape to cover the rust is a temporary and not a proper fix. Ignoring the rust will allow it to spread and potentially cause more damage. Painting over the rust without first cleaning it may not prevent further corrosion.