Porcelain sink repair kits are available at most places that sell home improvement supplies, including The Home Depot, Lowe's and Amazon.com. Pricing varies depending on the retailer and the size and contents of the kit needed for the repair.
Matching the correct color and type of repair material with the porcelain being fixed is crucial as not all porcelain fixtures are the same. Many of the repair materials are multi-part epoxy adhesives that require varying amounts of drying and curing time before the fixture can be used. Thorough sanding and cleaning of the surface area around the damaged spot is typically recommended before applying the repair material.