Sherwin-Williams
ProMAR® 400 is a water-blocking primer/finish that minimizes odors in damp areas. It seals interior masonry walls from hydrostatic moisture penetration, and it eliminates odors with a patented technology. It also carries the GreenSure® designation, ensuring it offers maximum performance and is manufactured to reduce the environmental impact and meet or exceed regulatory requirements. Its advanced formula inhibits growth of mildew on interior walls, and it can be used as a topcoat because it combines a primer and finish coat in a single product for better value.