Neither, I use a thin coating of Crisco on a Roul Pat mat, wipe away any excess. If I use powdered sugar or cornstarch I feel it dries out the fondant, and it also leaves a coating of powder on the finished fondant.
For gumpaste I use a non stick cel board with a thin film of Crisco.
I use cornstarch & crisco but a lot of the time I just use crisco. I try to keep enough crisco on my hands too~
Crisco if I don't want it to dry out too fast, cornstarch if I do. Often wondered about the PS tho - just never tried it.
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