A water-based dust-proofing, chemical resistant, flexible and elastic sealer for porous walls and similar surfaces.Wall Seal Clear is a one-component non-yellowing polyurethane sealing and coating product for interior and exterior concrete / porous stone walls and similar uses where dust control, resistance to aqueous chemicals and mild chemical attack is required, without the unsightly ageing discoloration of aromatic polyurethanes or other low cost treatments. It provides fast drying, matt, virtually invisible silky smooth protection to the surface with no change in colour or tone when applied as recommended.