A Cake’s Crumb Coat

So, you’ve taken your cake out of the over and it has cooled. What now? You’re ready to frost it! Woah, Speedy Gonzalez! Put down the butter knife and the rubber spatula. We’re not there yet.

So for smoothing a cake well, you first need to cover the cake with a thin layer of frosting called the “crumb coat”. Many people don’t understand the importance of the crumb coat, but it is critical to any successful cake. The crumb coat is the same icing you’ll use to cover the top of the cake, only it is thinner. Usually, about the consistency of sour cream is just right.

All you need to do is spoon out a dollop or two of the icing you’re using for the rest of the cake into a small bowl. Add a tad of water to the frosting to thin it out. Cover your cake with a thin layer of the crumb coat and then set it aside to stiffen up or create what is called an “air crust”. Some people choose to put it in the refrigerator or freezer to speed up the process, but I think the wait is best spent at room temperature.

The addition of a crumb coat is crucial to a good cake. First, a crumb coat (obviously) contains the crumbs. These crumbs came from leveling the cake, after it was cooled. The leveler helps you to create a more even and balanced finished product.

The second purpose of the crumb coat is to seal in the freshness! When the air crust forms, you are sealing in the goodness and then it is coated with a second layer of icing! That’s double the freshness! The second layer of icing on a cake is like the paint and the crumb coat is just the primer. It doesn’t have to be beautiful, but it has to cover the cake (lightly) and be efficient.

I’d recommend for your first time experimenting with a crumb coat, go lighter than heavier. If a crumb coat is too heavy, you may not have enough icing to frost the rest of your cake with the regular icing. It’s easier to realize if you didn’t’ have enough crumb coating and to add more next time. Also it’s not the end of the world if a crumb ends up on the outside of your cake. Just stick a tooth pick at it and scoop it up.

I know at my house, my cakes don’t have to stay fresh for too long before they’ve been all gobbled up, but without the crumb coat—I’d have some serious problems!