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I’m going to restore an old Cast Iron claw foot tub. I’m planning on spraying white polyurethane Enamal on the interior, and oil based enamel on the outside. Someone once told me they use an acid to deep clean the inside. Does anyone know what kind of acid? Does it etch the glaze as well? Any other suggestions I should be aware of?
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Ugh! Send it out to a pro! Around here it isn't very expensive, and you have have the exterior done too. There are speciality chemicals involved that I wouldn't want to breathe.
I've heard that even the best methods will chip after ten years or so.