For beginner cake decorators, one of the hardest things to overcome is uneven icing. It takes some practice to attain a nice smooth finish to the buttercream on the cake.
Chill the cake before you start frosting. A warm cake is more apt to break apart. Chill before and after filling it. Often, if you frost the cake right after you fill it, later on the filling will bulge out of the middle of the cake. By chilling first, the cake has time to settle and anything that wants to squeeze out of the sides can be smoothed with the spatula.
It's very helpful to use a lazy suzan. It allows you to turn the cake continuously while icing so you have fewer lines from stopping and starting again. One way to ice to apply a crumb coat. This can either be a thin coat of buttercream or an apricot glaze. To use an apricot glaze, thin apricot jam with hot water and press it through a strainer. Then brush it on the cake with a pastry brush. Chill it and give it time to firm up.
A great way to save time is to use the #789 Wilton cake decorating tip. If you don't have this tip, then carefully place the icing on the cake and move the spatula back and forth without actually touching the cake. You will be pushing the icing from the middle outwards. If using the tip, you'll have to cut a large hole in your cake decorating bag, so that bag will be just for this tip. The buttercream should be medium consistency. That means not so thin that it runs and not thick enough to pull on the cake. Thick icing will pull crumbs into it or tear the cake.
Start piping the icing on the cake, starting from the base. Hold the tip against the cake so the lines are facing inward. Pipe all around the bottom and then start another line of icing all around the cake right above the last one. Continue all the way up the cake, going a little past the top of the cake. This extra overlap of icing at the top will help to make a cleaner edge on the cake. Now use either a metal spatula, a bowl scraper or a spackle knife held vertically against the side of the cake at a 45 degree angle to smooth the sides. Scrape off excess icing as you go. Continue going over the sides until they're pretty even.
Move on to piping lines of icing across the top of the cake. Starting from the outer edge, use your spatula to smooth the icing towards the middle. Scrape off any excess icing. Continue all around the edge of the cake this way. Now pull the spatula straight across the cake. Do this over the whole top of the cake, removing excess icing. Lift away any icing that's sticking past the edge of the cake.
If you've iced the cake with crusting buttercream, at this point you will now let it set for 15 minutes or so or until it feels firm to the touch. (When you touch it, no icing comes off on your finger). Next, you can either use a Viva paper towel, wax paper, or parchment paper. Place the paper towel against the side of the cake and smooth the spatula across it a few times. Move the paper towel over to the next spot and repeat the process. Continue doing this over the entire cake. This will completely smooth out the icing. The wax paper and parchment paper are not quite as flexible as the paper towel, but they will do the trick if you can't get Viva paper towels.
Chill the cake before you start frosting. A warm cake is more apt to break apart. Chill before and after filling it. Often, if you frost the cake right after you fill it, later on the filling will bulge out of the middle of the cake. By chilling first, the cake has time to settle and anything that wants to squeeze out of the sides can be smoothed with the spatula.
It's very helpful to use a lazy suzan. It allows you to turn the cake continuously while icing so you have fewer lines from stopping and starting again. One way to ice to apply a crumb coat. This can either be a thin coat of buttercream or an apricot glaze. To use an apricot glaze, thin apricot jam with hot water and press it through a strainer. Then brush it on the cake with a pastry brush. Chill it and give it time to firm up.
A great way to save time is to use the #789 Wilton cake decorating tip. If you don't have this tip, then carefully place the icing on the cake and move the spatula back and forth without actually touching the cake. You will be pushing the icing from the middle outwards. If using the tip, you'll have to cut a large hole in your cake decorating bag, so that bag will be just for this tip. The buttercream should be medium consistency. That means not so thin that it runs and not thick enough to pull on the cake. Thick icing will pull crumbs into it or tear the cake.
Start piping the icing on the cake, starting from the base. Hold the tip against the cake so the lines are facing inward. Pipe all around the bottom and then start another line of icing all around the cake right above the last one. Continue all the way up the cake, going a little past the top of the cake. This extra overlap of icing at the top will help to make a cleaner edge on the cake. Now use either a metal spatula, a bowl scraper or a spackle knife held vertically against the side of the cake at a 45 degree angle to smooth the sides. Scrape off excess icing as you go. Continue going over the sides until they're pretty even.
Move on to piping lines of icing across the top of the cake. Starting from the outer edge, use your spatula to smooth the icing towards the middle. Scrape off any excess icing. Continue all around the edge of the cake this way. Now pull the spatula straight across the cake. Do this over the whole top of the cake, removing excess icing. Lift away any icing that's sticking past the edge of the cake.
If you've iced the cake with crusting buttercream, at this point you will now let it set for 15 minutes or so or until it feels firm to the touch. (When you touch it, no icing comes off on your finger). Next, you can either use a Viva paper towel, wax paper, or parchment paper. Place the paper towel against the side of the cake and smooth the spatula across it a few times. Move the paper towel over to the next spot and repeat the process. Continue doing this over the entire cake. This will completely smooth out the icing. The wax paper and parchment paper are not quite as flexible as the paper towel, but they will do the trick if you can't get Viva paper towels.
About the Author:
Theresa Happe is a baker, cake decorator and co-creator of CakesWeBake.com, a social network for cake decorating where you will find thousands of cake photos, cake decorating videos, a live chat and forum.