Something to be aware of when turning Bowls:- When you sharpen your Bowl Gouge you may get a tiny “Burr” on the heal of the bevel that then results in scratches in your piece at the point of transition between the wall & the base on the inside. It’s always worth checking for a burr on the heal, and if you find one, just remove it with a fine file and then a bit of fine sandpaper, just to make sure the heal is smooth.
-- Keith, Norfolk England. Why Burn it when you can Turn it??!!