ROMEX ECOFINE Ready-Mixed Jointing Mortar is easy to install and ideal for joint widths greater than 1/8" on porcelain tile and natural stone, or 1/4" on concrete pavers. Simply pour the vacuum-packed mortar onto the surface, apply water, and sweep it into the joints with a squeegee. Once exposed to air, ECOFINE hardens to help prevent weeds and ants while eliminating the need for frequent touch-ups or replacement.