I finally got some coleman porcelain!
One of my huge pet peeves is when you are at an art show or gallery looking at lided pots and the lids are so loose they wobble all over. Cmon potters take the time to make a lid that's at least close to being snug!
Here is a tip for super tight lids.... Throw your flanges and the lips if your pots thick with the lid being slightly too big. Then while you are trimming trim the lid to the perfect size. So easy and will make your pots that much more professional!
Valve grinding compound is also essential after glaze firing.