ARDEX X 78™ MICROTEC® Fiber Reinforced Semi-Pourable Thin Set Mortar ARDEX X 78™ MICROTEC® is a pourable thin set mortar for the most challenging horizontal installations of large format tiles in exterior or interior applications with high traffic areas such as malls, retail stores, lobbies, hotels and plazas. ARDEX X 78 is an easy to mix, one-component polymer-modified thin set mortar with MICROTEC fibers that can be poured, but still holds its trowel lines and provides outstanding coverage without the need to back butter. • Open time: 60 min. • Very easy to mix and place • Excellent flexibility and strength • Ideal for high traffic areas • 4-hour pot life • Amazing coverage: 105 sq. ft.