What type of glue is best for terracotta clay pots ?

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i am trying to make table top water fountain with some terracotta clay pots. But the design I made need my pots to be glued to each other. What type of glue will work best and is waterproof. Good for fountains ? Thats my design. Thank you for ur suggestions in advance.
q what type of glue is best for terracotta clay pots
  14 answers