To stick icing, specifically fondant decorations, to a cake, you can use a little bit of water.
Here's a breakdown:
- Using Water: According to a video from Wilton, a food-safe decorator brush can be used to apply a small amount of water to the back of fondant or flower appliques. This allows the decoration to attach easily to the cake.
In summary, a small amount of water acts as an adhesive to stick icing decorations to a cake.