Things You Will Need
Fireclay rarely suffers from chips or scratches, but when it does you can acquire a repair kit from your sink’s manufacturer to reinforce the damaged area with similar damage-resistant material.
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Clean the damaged area with a rag dampened in warm water and an all-purpose sink cleaner. Mildly abrasive cleaners are fine for removing any stains in the damaged area. If necessary, use a solvent cleaner, such as mineral spirits, to remove grease or wax.
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Dry off the area thoroughly with a lint-free cloth. Shake your fireclay repair compound that comes with your repair kit for two full minutes to ensure that it is ready for use.
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Apply the compound to the damaged area with the provided applicator. If the kit does not come with an applicator, use a toothpick or cotton swab to spread the repair compound. Make multiple passes, applying thin layers of compound until the damaged area is completely covered.
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Protect the repaired area from moisture and pressure for at last 24 hours so that the compound can dry fully.