Overnight retard for soudough

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Hi everyone, 

When I retard my sourdough overnight in the fridge, I cover my dough in the proofing baskets with plastic shower caps. However, I recently saw a video on YouTube by Bake With Jack, and he suggests leaving them uncovered in the fridge to form a skin. 

Do you retard covered or uncovered? Would there be advantage to forming a skin on the outside of the dough before baking?

 

Thanks.

I put my dough in a banneton In a plastic bag.  I do find that they banneton does it job and helps create a skin.  The plastic bag does its thing and keeps smells out.

Benny