What is the use of Modge Podge while making the clay pot?

You cannot use the same clay for making pots and sculptures because the clay that is good for throwing on the wheel may not be suitable for making sculptures.

Try using baking soda and water and letting that sit on the pot for an hour or two before washing off and cleaning it as usual.

In the Eastern Orthodox churches, you touch your pinched fingers to your forehead, saying "In the name of the Father," then to your belly button, saying" and the Son, "...

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I don't think you should use a cast iron pan but it could work if you are desperate. I would definitely use a gas stove.

The seal is to avoid the water leaking back into the pot. If you notice, there is a tube that comes out through the hole and sealed around it.