I am new at this....I heard if you make a fondant decoration and it sits directly on buttercream, after a few hours it starts to 'melt'.

I have cupcake toppers decorations made of fondant and want to place them on top of piped marshmallow icing. Anyone know if it will 'melt'?

Not sure what "marshmallow icing" is, but I have placed fondant decos on butter based buttercream and hi ratio shortening buttercream--they do not melt.

You can't place fondant on whipped cream/cool whip/BetterCreme icings because they will melt. Those icings have a very high water content, unlike standard buttercreams.

HTH
Rae

Thank you for your reply.

It's called a boiled fluffy icing, made to look like marshmallows.

Recipe:

Ingredients:

3 tablespoons Meringue Powder
1/2 cup cold water
2 cups granulated sugar
1/4 cup corn syrup
1/2 cup water

I'm guessing this recipe is likely too high in water? Maybe I'll just stick to my regular buttercream icing to be safe.

It does sound like a "wet" icing. I assume that it crusts, but if the fondant comes into contact with the wetness of it, all bets would be off.

Hope it all works out OK for you!
Rae