The temperature in the oven should be at 325 degrees. The Shrinky Dinks should be put into the oven once the oven is preheating. You can bake them for a few minutes. Shrinky dinks will flatten back out at first. For 30 more seconds, bake them back out.
Let's Get It Fixed!
HomeX virtual experts will assess your issue (for free!) and can resolve simple problems.