Pre-sanded, self-leveling, cementitious underlayments with the highest compressive strengths in the industry (7000 – 10,000 psi). Durock™ Brand Quik-Top™ Self-Leveling Underlayment sets and dries extremely quickly, minimizing downtime – ideal for commercial and institutional repair and renovation projects. Durock™ Brand Quik-Top™ White Self-Leveling Underlayment and Durock™ Brand Quik-Top™ Gray self-leveling underlayments' innovative self-sealing technology typically eliminates the need to seal the floor prior to applying the floor-covering adhesive.