IMB..YUM! sorry, just as MelC says, it doesn't crust. Once you bring it back to room temp, it gets soft and silky.
You might try using the mat once it's cool and firm, but any warmth from your hand, etc will soften the buttercream.
Sorry, but IMBC won't crust. Once you put it in the fridge you might be able to use the mat but I think you could have a hard time and not get the result you want. Truthfully, if it were me, I would forget about the impression mat. This is my own opinion. Someone out there might have a solution.
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