Build This Beautiful Concrete Bench. To create the curved sections of the leg molds, install a block on the inside of each curve and bend plexiglass around it; make sure the straight sections of the plexiglass extend past the bottom of each leg.
Top up with the remaining mixture, screed the surface, and flatten with a trowel. Repeat for the bench top using the identical amount of concrete mix. Cover the parts with plastic sheeting, and leave to cure for a couple of days.