Custom Building Products® Polyblend® Plus PBPG0925 25 lb Bag #9 Natural Gray Sanded Grout. Polyblend® Plus has all of the great features of original Polyblend®, plus some new value-added enhancements to improve performance, finished color, and color consistency. It is now an ANSI A118.7 polymer-modified, cement-based sanded grout that produces hard, dense joints that resist shrinking, cracking, and wear. Formulated for durability, Polyblend® Plus Sanded Grout accommodates 1/8″-1/2″ (3.1-12.7 mm) joints for interior or exterior installations, including floors, countertops, walls, ceilings, showers, fountains, and pools.