Thompson's One Coat Water Seal 5LThompson's One Coat Water Seal 5L is a unique, silicone micro emulsion, designed to penetrate exterior brick and stonework, to provide a long lasting barrier against rain damage. Key Features Apply directly onto damp surfaces Stops damage caused by freeze and thaw Use on brick, concrete and stone Reduces efflorescence Touch dry in 2 hours Covers 4m per litre PREP Give the surface a decent scrub with a stiff bristle brush. Fill any cracks and do