What is best to fill in between stones for smooth walking area with shoes with heals wouldn't want someone to fall

For a jointing material that will harden, the joints between the “pavers” created with the QUIKRETE® Walk Maker® Building Form can be filled with QUIKRETE® Sand/Topping Mix (No. 1103) or the EarthEssentials by QUIKETE® Polymeric Jointing Sand #127557. Since the mold will create loose stones to create the individual pattern sections, you will need to form the outsides of the walkway in order to pour in the jointing material. It will be difficult to create a smooth walking area without at least partially covering the country stone pattern.