The step by step
Yellow halos due to limestone1 Let a tap leak for a few weeks and the hard water, laden with iron hydroxide, will quickly form a yellowish spot. As lime is insoluble in lukewarm or hot water, you should try cleaning with an anti-lime gel, less corrosive than scouring powders. Use a quackgrass brush and… scrub!2 If the traces persist, put on your gloves and clean with elongated water of white vinegar, then if that is not enough, phosphoric acid with 10% water. 3 This type of treatment may well make your enamel dull. You can revive its shine with a silicone glazing product, generally used to repair small incidents on car bodies. 4 Then, to bring back the shine, install a sheep skin disc on your drill.
Small shards1 When part of the enamel has burst, especially in the event of a shock, a deposit of rust quickly forms. With a small trowel, first "jump" all the parts that do not adhere completely, then neutralize the rust with tannic acid.
2 In case of "shortage", prepare a two-component epoxy mixture to seal the damaged area. Do not overload and proceed in very small quantities following the manufacturer's instructions for setting times. 3 After applying the fitting, to make the product even, use the solvent recommended by the manufacturer. To obtain a perfect finish, then lightly sandpaper with water.4 Then proceed to touch up with a spray paint, special bodywork. Please note, these volatile and harmful paints require a few precautions: always protect the surrounding surfaces. To do this, tape newspaper around the area to be painted. You also have to work in a ventilated room… which is rarely the case in a bathroom, so wear an effective mask! If you have to repaint the entire bath, remember to remove the silicone seal first. Observe drying times and temperatures. And wait 24 hours before taking a bath! 5 The old baths all have a white enamel, but for thirty years, manufacturers have offered various colors. This type of "enameling" is sometimes very practical if you want to keep your bathtub for a few more years. For particular colors, always make preliminary tests. In this case, it is usually necessary to paint the entire bathtub to hide the alterations.