INTERIOR & EXTERIOR: The low odour nature of the product makes it perfect for use both indoors & outdoors. SUITABLE FOR: Natural Stone (Including Indian sandstone, granite, slate and limestone) & Man-Made Stone, Travertine, Brick, Quarry & Paving. NATURAL FINISH: Premium grade water-based stone and masonry impregnator that penetrates into the surface to provide an invisble barrier, which protects natural and man-made stone surfaces from penetration by water, oil, dirt, limescale and grease. BREATHABLE PROTECTION: The breathable nature of the product prevents deterioration within the pores of the surface, which are caused by trapped dampness or moisture blooms. COVERAGE: 15-20m2 Per Litre Water Based Sealer GLEAN Patio Stain Stop Sealer is a water based impregnating sealer developed to provide an invisble and long lasting barrier, that protects natural and man-made stone surfaces from penetration by water, oil, dirt, limescale and grease. Breathable Barrier The breathable nature of the product prevents deterioration within the pores of the surface, which are caused by trapped dampness or moisture blooms, ensuring the stone surface remains looking good, whilst also protecting against stains.