What is Crumb Coat?

It's a thin thin layer of icing that you cover as your first layer. On the crumb coat layer you don't have to worry about crumbs getting in the icing(just don't put the crumb icing back into the bowl) This thin layer is then put n the fridge to completely crust over. Then when you go to do your second layer of icing, there is no way crumbs can get in the last layer. It guarentees a very clean iced cake.

It's a light coating of frosting used to seal in the crumbs before you put on the finishing coat of frosting.
Hope that helps.

Crumb coat is when you put just a very thin layer of icing on your cakes. The purpose is to keep all the crumbs in that layer so when you put on your regular coat of icing you have no crumbs in that layer. You should let your crumb coat crust a while or put in freezer before adding your final layer of icing. Some only use the crumb coat when working with fondant.

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