Once you're happy with how it looks on your arm, it's time to bake it! I like to use a glass that tapers at the bottom for a perfect fit. My glass was similar in size to my upper arm, so I draped the clay around the smallest end. Make sure the arms aren't hanging loose by gently pressing the ends onto the glass. You can use any oven-friendly prop for baking, such as wood, metal, porcelain or thick glass.