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Then, why is my royal icing not smooth?
It's not because we don't want to help eachother, it's because there isn't just one perfect royal icingconsistency. Why is that you ask? It's because humidity plays a bigpart in how the icing behaves. Humidity can cause theroyal icing to be runny and not allow it to dry in atimely manner.
Also question is, why is my royal icing so thick?
If after making these adjustments, you think youricing is too thin or too thick for yourapplication, don't worry. The icing consistency can beadjusted at any stage of the decorating process simply bystirring in sifted powdered sugar to thicken, or water to thin. Foroutlining: Add 1/2 to 3/4 teaspoon water.
Once your royal icing has been piped on, you canset it out to dry. After just 15 to 30 minutes, it will forma thin crust on the surface, but it generally will stay wetunderneath for several hours. I usually set my cookies out (in asingle, flat layer, on parchment-lined baking sheets)overnight to dry.