Smartseal Solvent-Free Block Paving Sealer from Smartseal has been designed to prevent weeds from growing within the joints of block paving. Due to being a solvent-free block paving sealer and weed inhibitor, it emits no smell or fumes as a result of its solvent-free formulation. Largely effective, with ease of application, this sand hardener and block paving sealer inhibits the regrowth of weeds and moss and protect blocks. For optimum results to allow product to seep roughly 20mm into joints, apply at a ratio-dependent on the width of joints at 1.5 m2 per litre first coat, and approximately 4 m2 second coat. Ease of application by watering can & squeegee. Formulated to BS5750/ISO9001 standard.