Hi, I am using Diy cold porcelain clay that I made with glue and cornstarch. I add the food coloring and use the clay to make all sorts of items. I like that I don't have to paint it. If I do paint it, I usually wait until it air dries and then use acrylic paint let it dry and then seal it with water based polyurethane. Food coloring doesn't work with wet clay. With wet earth clay it is a good idea to let item dry, then paint it with gesso to give the clay tooth and the paint and seal as usual.