I am attempting to make a gambling themed cake that must be done for next Friday. Today I plan on cutting out "cards" and "coins" to set up an dry. How long do I need to wait before I can paint on the dry gum paste decorations? Also, I'll be making a version of the "Welcome to Las Vegas" sign. Since I am fairly new to using gum paste, should I stick on edible glitter while it is still soft, or should I wait for it to harden. Another question...One of the tiers I would like to add a diamond/harlequin effect. Is this best achieved by laying fondant over fondant or gum paste over fondant. Or perhaps there is a better way that I don't know if. Thanks in advance.