Objective: How to cure and seal concrete?

Which of the following solutions is more sound in terms of naive physics reasoning?

Select from the following. 1). Let the concrete set for 48 hours. Remove the concrete from the wooden form and sand down the corners. Put on a concrete sealer.. 2). Let the concrete set for 48 hours. Remove the concrete from the metal form and sand down the corners. Put on a concrete sealer..
1).