I am making a wedding caked iced with Italiam meringue buttercream with gumpaste leaves and flowers all over. I have cut out the decorations and am letting them dry. They are all very light. I always use fondant for wedding cakes but this bride insisted on buttercream.
How do I attach the decorations to the cake? I've heard that the gumpaste softens if its in contact with the buttercream too long. How far in advance can I decorate the cake? Does it make a difference the type of buttercream I use?
Thanks for your help
LeahM

I made a birthday cake that had gumpaste flowers on buttercream. I attached them with bc on Sunday night and my friend served it on Monday night and they were fine.

My experience has indicated that the gumpaste decorations on buttercream are fine for 18-24 hours or so(depends on the temperature). I'd apply the gumpaste as close to the last minute as possible; I'd be tempted to apply the decor at the venue when I deliver. Just a dab of IMBC and they'll stick right in. After 18-24 hours the gumpaste can get soft and sloppy. I often try to do the decorations in modeling chocolate, if possible (though I can't get as much detail as I can with the gumpaste) since the modeling ch0colate doesn't get mushy.