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Step 1: Clean and prep the area

Thoroughly clean the entire sink with a mild cleaning agent and water. Make sure to remove all dirt, grime, and residue from around the damaged spot. Rinse the sink well and let it dry completely. For best results, use a cloth or hair dryer to ensure the area is bone dry. 

Step 2: Sand the hole

• Gently sand around the hole to smooth any rough or jagged edges. Sanding helps the filler adhere properly and creates a smooth transition between the repair and the original surface.
• Wipe away any dust or debris with a clean cloth. 

Step 3: Mix the epoxy filler

• A porcelain repair kit contains a two-part epoxy filler. Wearing gloves, follow the kit’s instructions to measure and mix the compounds.
• Typically, you will need to knead the putty or mix the paste for about one minute until you achieve a uniform color. 

Step 4: Apply the filler

• Apply the epoxy filler to the hole. Use a small wooden stick or putty knife (often provided in the kit) to press the mixture firmly into the cavity, making sure it is fully filled.
• For an extra smooth finish, dip your finger in warm, soapy water and gently rub the area to blend the patch with the rest of the sink.
• If you over-apply the filler, use a cotton swab dipped in nail polish remover to wipe away the excess before it cures. 

Step 5: Cure and sand the patch

• Allow the filler to cure for the time specified in the kit's instructions. Curing times can range from 15 minutes to 24 hours.
• Once the filler is completely hard, wet-sand the patched area lightly with fine-grit sandpaper until it is perfectly smooth and flush with the rest of the sink. 

Step 6: Apply the finish

• If your kit includes a touch-up glaze or enamel paint, apply a thin coat to the repaired spot using the included brush.
• Allow the first coat to dry, then apply additional thin coats as needed for full coverage, following the manufacturer’s instructions.
• Once the paint is fully cured, your sink is ready for use.