Cool cakes until they are no longer warm to the touch before storing them in order to prevent sogginess. However, a cake that has been brushed with syrup can be stored while still warm. If a cake is still warm when buttercream is applied, the buttercream will melt.
To refrigerate or freeze cake layers, wrap them airtight so that they don’t lose moisture or absorb odors from the refrigerator or freezer. Wrap the cake first in plastic wrap, preferably one that is designed for freezing, and then place it in a heavy-duty plastic freezer storage bag, pressing out as much air as possible before sealing the bag. A drinking straw works well for sucking out the air.