Cool layer cakes and sheet cakes 15 minutes in pans and then turn out while slightly warm. They are too fragile to turn out when hot, and they may break.
Turn out layer cakes onto racks to finish cooling.
To turn out sheet cakes:
Sprinkle top lightly with granulated sugar.
Set an empty sheet pan on top, bottom side down.
Invert both pans.
Remove top pan.
Peel parchment off cake.
Cool angel food cakes upside down in pans. Support the edges of the pan so the top of the cake is off the bench. When cool, loosen the cake from the sides of the pan with a knife or spatula and pull out carefully.