If you use the clear shrink plastic, remove the Silhouette-branded liner and place the shapes printed side up onto a parchment-lined cookie sheet. If you use white shrink plastic, place the printed shapes printed side up onto a parchment-lined cookie sheet. The baking process takes approximately two minutes. Watch as the piece shrinks (it will curl and move and then lay flat again). The shapes will be much smaller and thicker than the shapes you started with. When you see that your piece is flat (or almost flat if you bake a bigger piece), quickly but carefully remove the cookie sheet from the oven. Right away, gently press the piece flat using a flat tool. You have a couple of seconds to flatten the piece because the plastic cools down pretty quickly. The piece may stay slightly curled if you don’t flatten it fast enough.