To cover the edge of the board, roll some fondant into a long sausage, and roll this out into a flat strip. Trim one long edge with a sharp knife to give a crisp edge. Dust the icing with cornflour and roll it up. Brush the board with a little water and unroll the icing strip around it, pushing it up to meet the bottom edge of the cake. Cut the strip when it meets the first end, and smooth out the join with your fingertips. Using you hand or the cake smoother, smooth out the icing on the board, Use a sharp knife to trim the excess from the edge of the board. Smooth down the edge with your finger tips.
Wedding cake was originally a luxury item, and a sign of celebration and social status. The bigger the cake, the higher the social standing. Wedding cakes in England and early America were traditionally fruit cakes, often topped with marzipan and icing with tiers, Cutting the cake was an important part of the reception. White icing was also a symbol of money and social importance in Victorian times, so a white cake was highly desired. Today, many flavors and configurations are available in addition to the traditional all-white tiered cake.
You should use a recipe specifically designed to be a wedding cake as it will ensure that it is sturdy enough and that it makes the right amount of batter and icing. For a three-tier cake, you need to make three cakes of 12", 9" and 6", as well as a massive amount of icing. Most three-tier cake recipes have a step-by-step schedule for when you will need to bake and assemble each part.