Steaming it will help, but I've also noticed that if I use Crisco while rolling it out (instead of cornstarch or powdered sugar) it will add a little shine as well.
I just started making cakes and we have a cake that has been around long enough that it is time for it to go. (I have four people in my house and we are throwing away chocolate cake!) AMAZING! Anyway, before I throw it out I wanted to see what would happen if I used my garment steamer on the fondant. It really does shine right up. You wouldn't want to touch it right away but it dries back up and keeps the shine. I've let it sit for a couple of days to see what it would look like and it still has some shine to it.
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