Step 1: Create yellow glitter glaze: in a bowl, squeeze 1 part red glitter glaze and 2 parts yellow glitter glaze.
Step 2: Combine the colors together to create orange glitter glaze.
Step 3: Create purple glitter glaze: in a bowl, squeeze 1 part red glitter glaze and 2 parts blue glitter glaze.
Step 4: Combine the colors together to create purple glitter glaze.
Step 5: Scoop the orange and purple glitter glaze into their own piping bags.
Step 6: You will now have the colors of the rainbow.
Step 7: Cut about 1/4” off the tip of each bag.
Step 8: Alternate the colors and squeeze the glitter glaze around the top edges of the cake. Longer squeezes will create larger drips, while shorter squeezes will create smaller drips.
Step 9: Continue dripping with all colors in a pattern
Step 10: Using a piping bag and star tip, pipe dollops of buttercream around the top of cake.
Step 11: Finish the cake off by adding rainbow sprinkles!