New Watertan is a waterproof paint using a one-component water-soluble urethane resin. It forms a coating film having strong elasticity, adhesion force and durability and excellent waterproof property. Therefore, it prevents water from penetrating into cracks due to contraction and expansion due to temperature difference of architectural base, It is a water-soluble paint suitable for waterproofing roofs and flat roofs with a slope that is gentle and protected.