Ceramic and porcelain are closely related materials, and you’re able to make chip repairs on every one using the same procedure. Ceramic is more compact and porous, because it’s fired at a lower temperature, which makes it marginally less durable and more susceptible to chipping than porcelain. When done with patience, the repair will so tightly match the rest of the sink, you will likely be the only one that knows it’s there.
Buy a porcelain repair kit, an product typically stocked at home centers and hardware stores. Select a kit that matches the color of your sink. If possible, check with your sink maker, which will probably stock a repair kit in your color.
Clean the repair area with soap and water to remove any fingerprints, oils or soap buildup in the area. Rinse well, and allow the prep area to dry thoroughly.
Sand the chip using a light touch. Your repair kit likely supplies a small piece of sandpaper, but you can use a fine 220-grit paper as a substitute. Only sand across the dining room.
Rub the area with denatured alcohol, which will further clean the repair and clean out any debris out of sanding.
Mix the filler components in case your repair kit provides them. Some kits include a patching substance that could possibly be a one- or two-part filler, as well as a tinted glaze. Other kits only contain the glaze. Patch the chip with different light layers of filler, and allow the material to dry completely between layers. The final layer should overfill the chip using a hardly noticeable raised area.
Sand the stitch gently after the last layer has dried completely.
Paint the chip with glaze applied above the flux in many light coats. Use just a small amount of glaze using each coat, and allow the glaze dry thoroughly between each coat. This procedure may take a few extra coats if the kit did not have a filler. Feather every layer outside beyond the chip so the repair blends in naturally with the rest of the sink.
Sand the glaze after the previous layer has dried. Buff a shine to the glaze using a soft cloth, like an aged T-shirt.