How to Crumb Coat a Cake for a Smooth Buttercream Finish
A crumb coat gives your cake a thin, steady base by trapping loose crumbs and smoothing the surface before final frosting. With a cooled cake, soft buttercream, and a short chill, you can achieve a cleaner buttercream finish with far less trouble.
Essential Concepts
Thin first coat
Locks in crumbs
Chill before final frosting
Use soft, spreadable buttercream