MouldX anti-mould stain block contains biocides to prevent the browth of mould and mildew. It is an oil based damp seal and stain block. Self priming and highly pigmented. It will also cover water, soot and nicotine stains. Benefits Protects against the growth of mould & mildew Self priming damp seal & stain block Highly pigmented Also covers water, soot & nicotine stains