Gum paste is a versatile cake decorating medium. You can create an endless variety of gum paste flowers, from small, flat cut-outs to large, lifelike roses. Gum paste decorations can be quite heavy in comparison to other traditional cake embellishments. You must properly support larger pieces on the cake, or gravity will pull them off. There are a few methods by which you can effectively affix such flowers to the cake.
Follow your recipe or decorating template to form the gum paste decorations.
Prepare a gum paste adhesive if you are applying small or flat pieces of gum paste. You can purchase an adhesive or create one yourself. Microwave 2 oz. of gum paste and one tablespoon of water in a small bowl to create your own adhesive. Mix thoroughly with a fork or small whisk to achieve a smooth consistency.
Brush a thin coat of adhesive onto the back side of the gum paste flower.
Press the gum paste flower to the surface of the cake in the position you desire. The adhesive will turn clear as it sets.
Prepare frosting to attach medium-sized flowers that are multidimensional. Place the piping tip in the piping bag. Fill the bag with frosting. Match the frosting to the color of the cake's surface.
Pipe a small dollop of frosting onto the cake. It should be large enough to stabilize the flower, but small enough that the embellishment obscures it entirely.
Press the gum paste into the dollop of frosting adhesive gently. Allow the cake to remain exposed to air for a couple of hours after decorating it, in order to let the air harden the frosting slightly.
Apply toothpicks to large or heavy decorations. Hold the flower in one hand. Insert a toothpick halfway into the portion of the decoration that will make direct contact with the cake.
Place the decoration onto the cake. Insert the other half of the toothpick into the cake.