It's equal parts of each type of clay mixed thoroughly. Let it sit for about 5 minutes so it's not so sticky, then mold it however you want! The stuff adheres to most surfaces better than super glue. After about half an hour, it becomes hard enough to carve details into. At about 1 hour after mixing, I usually use a bit of water on my finger to smooth the surface. Let it cure for 24 hours, then you can sand or paint it.