A colour-coordinated porcelain sink adds an elegant touch to a kitchen. However, porcelain over cast iron is harder to maintain than stainless steel. No matter how careful you are, sooner or later tiny grey scratches caused by stainless steel pots will appear. These superficial marks are fairly easy to remove, but deeper scratches require specialised treatment and the use of a porcelain repair kit. Badly stained and scratched sinks can also be restored with a porcelain and tile refinishing kit.
Cover superficial grey stainless steel scratches with a layer of hob cleaner. Let the cleaner stand for 15 minutes. Buff the area with a sponge-backed pot scourer. Rinse well and dry with a paper towel.
Scrub the area surrounding deeper scratches with a strong household detergent and a stiff bristled brush. Wipe dry. Remove all traces of detergent by cleansing the area with denatured alcohol and a soft cloth.
Prepare the correct colour paint from a porcelain repair kit. Follow the manufacturer's directions; some kits use an epoxy finish that needs to be mixed with a hardener, other kits come with a separate tint that must be mixed with a neutral base for colour matching. Test the colour on a paper plate before carrying out the repair
Use the finest artist's watercolour paintbrush you can find to apply progressive thin layers of paint to the scratch until you achieve the desired colour match. Blend paint edges by dry brushing outwards toward the surrounding surface. Allow adequate drying time between each coat.
Many porcelain sink and bathtub manufacturers offer porcelain repair kits that match the colour of their products perfectly.