Ronseal 34578 Thompsons One Coat Damp Seal Paint 750ml. The Thompsons RSLTOCDS750 is supplied in a tin with re-sealable lid. This paint provides a reliable solution for sealing damp surfaces before painting. It is micro-porous, allowing trapped moisture to escape and can be applied directly to damp surfaces. It permanently stops the reappearance of stains. The 750ml tin is supplied with a resealable lid for convenient storage and application. Features: One coat application, Blocks stains, Seals damp surfaces, Resealable tin. Specifications: Brand: Ronseal, MPN: 34578, EAN: 5010214845781, Size: 750ml. Weight: 2.34130922244 pounds.