Verify the evenness of the royal icing. Utilize thicker sections of icing on the borders' of the cake. Use thinner icing to cover the surface of the cake. Decorate and outline the cake. You can make icing thinner by adding water to it.
Move the icing to the plastic squeeze bottle. Place the bottle's nozzle in the middle of the cake. Compress the bottle. Let the icing cover the surface of the cake. Don't let the icing drip off the sides of the cake.
Utilize the rear of the spoon to spread the royal icing evenly over the cake.