I need to trace double hearts on the sides of a buttercream 4 tier wedding cake and I was wondering what type of icing I should use to get a shinny yet flowable look to hearts.
Welcome to Cake Central. A shiny smooth heart would typically be done on a flat surface (or just slightly curved) in royal icing or Colorflow, dried then placed against the side of the cake.
You could finish your hearts with Luster Dust to get them all shiny. I have seen silver, gold, just about any color you could imagine. Using that will help give your hearts a little extra shine to stand out from the buttercream.
Just remember that royal incing and buttercream are not friends, and will melt royal. Will you be using color on this cake? If so (or not) just use the "Decorators"buttercream icing. Its just buttercream made firmer. And do your hearts with that. Just a thought....
Thank you all for the ideas. I think I will try the color flow or royal and place them on last minute so the break down process will not have time to actually set in.