Polyblend Plus is designed for highly glazed or polished tile, marble and natural stone that would be scratched by sanded grouts. This durable, non-shrinking grout accommodates joints up to 1/8 In. (3 mm). Ideal to be used for interior or exterior installations, including floors, countertops, walls, ceilings, showers, fountains and pools. Easy to use formula, just mix with water.