Simon Leach teaches you how to do ceramic trimming and sealing. You wet the top of the pot and place it on the wheel. You push down on the bottom, sealed side, when the wheel is spinning. You use the trim tool to cut into the base side. You do this at an angle and make sure you hold the trim tool like a stake knife, not like a pencil. You empty out the leg until you are pleased with it. You round off any sharp corners and you have to put the last piece, the seal. On the bottom you take a piece of clay and put it on the leg of the pot. You then take your seal stone and make an impression into that clay. Now you are done.