Prepares Surfaces For The Application Of Self-Leveling Underlayment's. Seals Porous Surfaces And Improves The Bond Of Underlayment's. MoldGard Technology Resist Mold And Mildew Growth. White Color. Covers 300-500 Sq Ft (28-46.4 Sq M) Per Gallon. Drying Time Up To 2 Hours. Soap And Water Clean Up.