A trowelable compound formulated as a quick-setting floor underlayment. Converts a rough, irregular surface into a smooth, dense and water resistant subfloor perfect for the installation of carpet, tiles, epoxy coatings, hardwood and other floor surfaces. Use over concrete, wood, stone and tile. Ideal for new construction or remodeling projects in residential or commercial applications. Indoor use only. Open to light traffic in four hours. Use Ash Grove Bonding & Fortifier Admixture as a substrate primer.