No, the ceramic piece provided is a high quality ceramic which has already been bisque fired but left unglazed. Unglazed bisque is the perfect base for the acrylic paint to be applied.
If you have purchased an item that needs to hold water 9 such as a plant pot or vase we clear glaze the inside so it is water tight. We will state in the item copy if an item has been clear glazed on the inside.