If countertops are created in sections larger than about 8 feet, they tend toward cracking and more complicated to move. Also, in the event the countertop is polished, the procedure can grind in the concrete, exposing aggregates. Begin by deciding the dimensions you are interested in getting the countertop to be. If you're precasting your diy concrete countertop, then troweling the cap of the concrete or polishing the base of the concrete in the mold is the best method to complete the countertop. If you're thinking of building diy concrete countertops for the very first time, you've come to the correct location.