Piece together the broken parts of the clay sculpture using school glue. Let the glue dry thoroughly before working on another piece.
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Hold the pieces together with the masking tape.
Leave the tape on the sculpture overnight. Remove the tape carefully the next day.
Make a paste by mixing 1 cup of small pieces of toilet paper with 1 tablespoon of regular glue.
Fill in gaps and cracks in the sculpture using the paste. Use a Popsicle stick to apply the mixture. Let the filled areas dry overnight.
Sand areas that are rough or overfilled with the repair mixture.
Paint or glaze the repaired areas and let them dry. If the sculpture was painted, spray it with clear spray paint. If the object was glazed, paint the damaged area with a clear gloss sealant or epoxy glue.