Dip a clean rag into warm, soapy water. Squeeze out all excess moisture.
Clean the area around the crack in the stoneware, using small circular motions to lift up any dust or other buildup .
Buff the area dry with a soft cloth.
Scrape the crack very lightly with the tip of an exacto knife to clean debris out the crack. Focus on clearing the crack, not making it larger. Wipe the stoneware again with the soft cloth to remove any grit.
Brush a thin layer of waterproof silicone caulk over the entire surface of the crack, trying to get the caulk inside the crack if possible.
Gently press together the sides around the crack. Hold it this way for two minutes.
Allow the waterproof silicone caulk to dry for 24 hours.
Scrape away any excess caulk on the surface of the stoneware using the dull edge of the exacto knife.