Make sure your fondant is perfectly even with the wilton fondant smoother backer cover your cake with fondant and then let the smoother work its magic smooth the sides of the cake and flatten the fondant to the buttercream under layer with this nifty tool air bubbles be gonethis fondant smoother has a softly curved front edge to prevent any marking of the fondant surface while you use your magic tool the square back of the smoother creates a straight edge along the base of the cake its e