I bought the assortment color pack of Shrinky Dinks at Michaels today. Since it has been more than 20 years of making a Shrinky Dink, I thought I would practice. My least favorite color of all time is brown, so that is the color I chose to practice on for making a wine charm.
Using George cartridge I cut the heart charm at 5", and placed in the oven for 2 mins at 325 degrees, it was too big, but I felt I had the hang of it. I then tried at 4", and the shape melted into each other, and by the time I tried to separate it was too late. I then tried 3" and that also melted into each other (maybe the shape is too delicate at a small size?). At this point I was determined to get the heart to work, so I cut it one more time at 2.75" and this time used my heat gun. As soon as the upper ends came towards each other, I used the heat gun to blow the heat and push it back down. It worked!!! I then took the heat gun to the other's that had melted to each other, and was able to un-melt them back into a heart.
Believe me they need some work, especially the second they are done, you need to press them down to make them more straight. I have tried paper, and a bottom of a glass but they still have some lumps.
I will just keep practicing and hopefully get better really quickly.
Check out this sped up clip of the first batch in the oven.