I once saw a tip from a fellow cake artist that they dry their gumpaste and fondant decorations in the oven – turned off and just with the oven light on. I’ve been doing that ever since and it works great. Sorry but not sure if it would work for runouts too. Hope that helps.
Maria @ http://www.facebook.com/rooneygirlbakeshop or http://www.rooneygirlbakeshop.com