In this Home & Garden video tutorial you will learn how to make a concrete counter top mold. Fu Tung Cheng from Concrete Network presents this video. For making different edges on your counter top, a compound called polyurethane is used for making the mold. It is a two part compound mixed together to form a rubbery substance. While using polyurethane follow the manufacturer's recommended dosage, time, proportion and also use the recommended release agent. Take a piece of the molding wood and place it in a mold. Then spray the release agent and pour the compound into the mold. The next day you can just pull it out and use it.