Standard cast iron bathtub once made of cast iron bodies covered with layers of porcelain that are baked in. If you have one of those old tubs, and porcelain is worn and dirty, unrealistic can re-bake, but you can refinish. Specialized primers and enamel paints, applied with a paint sprayer, are made to breathe new life into the old porcelain. Preparation requires de-glossing old surface with acid etching.
How to remake a cast iron bathtub are, Lay plastic sheeting on all surfaces around the bath (floors and walls), who recorded it in place with adhesive tape. Ribbon cutting and plastic parts more than any other accessory in the tub that cannot be removed. Cover all surfaces that are not porcelain. Put on your respirator, rubber gloves and protective clothing. Brush acid etching solution on the porcelain surfaces, covering all. Let it shine porcelain for 15 minutes. Rinse well. Let the surface dry for 24 hours.
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Load your spray paint primer porcelain. Put your breathing again. Cover the surface of the porcelain cast iron bathtub in a very light, thin coat of primer, making sure not to let it drip or form stripes. Let the layer dry for half an hour, and then apply a second coat. Let dry overnight. Load your paint sprayer with porcelain top layer. Apply the same way as you did the primer, using a very light, thin layer. Let it dry for half an hour.