Polycell One Coat Damp seal is formulated to seal patches of penetrating damp on interior walls and ceilings, preventing it from showing through and spoiling the look of your room. Specially formulated to seal patches of penetrating damp on interior walls and ceilings in just one coat preventing them from showing through and spoiling decorations. WARNING Flammable and Irritant. Keep out of reach of children. Always read instructions. Polycell Damp Seal 500ml