Mapei Ultra-Premium Sanded Grout. A Portland cement-free grout, it is formulated with MAPEI’s High-Hydrated Cement Technology (HCT™) to prevent color inconsistency and efflorescence while building high early strength. This rapid-setting grout allows foot traffic in only three short hours after application, while staying durable and allowing the grout color to stay consistent and accurate, with no unsightly shading or mottling. Sold by the bag.