once I pipe cupcakes with no-butter buttercream (i'll be using solite, an australian shortening) can i just leave them on the bench for a day or do they need to go in the fridge? thanks!
Butter or not, shortening can still melt. Depending on how hot it is, I would refrigerate them some just in case.
once I pipe cupcakes....
....can i just leave them on the bench for a day or do they need to go in the fridge?
Cupcakes can dry out fast, especially if refrigerated. I'd leave them out at room temperature, but be sure to box them or use a container to maintain moisture.
I agree that fig'ing any cake will dry it out quicker. I would box them,. then put the box into a plastic bag OR cover it w/plastic somehow.