Yes, you can use any plastic chocolate mold and you don't need to spray with Pam..just make sure it is well set and cold, like put it in the freezer for about 10 mins., and when it comes out, it should just slide out or pop out easily when you turn it upside down. 
I am not sure what kind of mold you are talking about. The plastic molds are for chocolates. Candy melts are the same thing. Melt them in your microwave for 20 second intervals, stir, & keep doing til melted. Do not put anything into the mold to prepare it. Just pour the choc. in & you place it in the freezer to mold.
What I want to use it for is either fondant or gumpaste, maybe a mix of both.
yes...the molds will work...dust w/ powdered sugar for fondant. I have several molds for fondant made from the same plastic as the ones for chocolate...can do fondant or chocolate interchangeably. Just push in, trim off excess and them pop out (may require a rap of table/counter top)
not sure if it's powedered sugar or cornstarch for gumpaste. anyone else know??
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