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One of my cast iron radiators is completely rusted. I decided to give it a second youth. However, after having sanded it roughly, I wonder about the paint to use because I would like to be quiet for several years. Could you tell me?

The procedure is available in our DIY sheet MAINTENANCE OF RADIATORS.
If you have only roughly sanded the radiator, the rust may come out. Then apply a rust inhibitor (Frameto style) to neutralize it. This solution can however be expensive.
For the painting itself, you can find specialized paints in the range Julien Paintings, intended for application on central heating radiators.

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