UltraMix Designer Series Paver Joint Sand - Charcoal Blue Blend (50# bag) Designer Series Sand used for paver, brick, flagstone and natural stone joints from 1/8" to 1" wide | Compliments popular paver and natural stone colors and color blends (1) 50lb bag covers up to 80 square feet of pavers with 1/8" wide joints | (1) 50lb bag covers up to 40 square feet of pavers with 3/4" wide joints Vivid, permanent color blends created by a proprietary color infusion manufacturing process | Meets ASTM C-144 paver joint sand requirements Most commonly used with Molecule JSS or NanoPave JSS (liquid polymer joint stabilizer & sealer) | High structural strength, dust and haze free By design, UltraMix Paver Joint Sand is not polymeric sand - Polymeric sands contain powdered polymers that can cause hazing on hardscape surfaces | Sand color may vary when sealed