Just met with a bride wanting edible crystals sprinkled here and there on the sides of her wedding cake.  It's horribly humid here in New England in August, my fondant cakes usually sweat.  Has anyone attached edible sugar crystals to a cake in these conditions and do you have any hints.  What do you use to attach them with so that the crystals retain their shine?  Do you rub the surface of each edible stone with liquid oil to perk up the shine?  Any help would be appreciated.