Fit the decorating bag with tip 18 and fill 1/2 full with medium consistency icing. Hold the decorating bag 90° straight up; the tip should be 1/4 in. above surface as shown. Pipe one group of triple stars.
As you pipe more stars, turn tip slightly so that stars interlock and area is covered without any gaps.
Continue piping stars and turning tip to fill in entire area. If you need to fill in missed areas, use tip 18.