Veganbaking.net - The Hows and Whys of Vegan Baking
Veganbaking.net - The Hows and Whys of Vegan Baking
  
To help frosting stick to your cake and make it as free from crumbs as possible, give it a Crumb Coat. This is a thin coating of frosting meant to absorb the outermost crumb of the cake. The cake is then placed into the refrigerator for about an hour so the frosting hardens. You then spread frosting over this hardened frosting with minimal fuss.