Thompson's One Coat Stain Block Damp Seal 250ml - Ronseal 34578, A high performance seal for sealing and covering damp, water and other household stains in one coat. Micro-porous formulation allows trapped moisture to escape. Can be applied directly to damp surfaces and permanently stops the reappearance of stains. The one coat formulation - allows the surface to be decorated in 4 hours. Coverage to 7m²/L depending on the porosity of the substrate.Allow 4 hours between each coat. After the second coat, leave for a further 4 hours before decorating.The Thompson's RSLTOCDS750 is supplied in a tin with re-sealable lid. 750ml. Ronseal 34578 Thompson's One Coat Stain Block Damp Seal 750ml