Start the timer and stir the contents of the cup with your craft stick for 2 minutes, making sure to scrape the sides of the cup from time to time. Don’t worry if you see lots of bubbles forming in the cup – they’ll disappear later. When the timer goes off, place the second plastic cup on your work surface and have your second unused craft stick ready for stirring. Optional: If you would like to add glitter to your case, sprinkle some into the mix now.