Zinsser Bulls Eye 123 Primer Sealer is a universal interior and exterior water-based primer-sealer. This fast-acting formula prevents rust formation on clean ferrous metals like iron and steel, and seals various stains. It is highly resistant to mould and mildew, making it ideal for high-humidity areas such as bathrooms or laundry rooms. The primer offers excellent adhesion to hard-to-stick surfaces without the need for sanding, drying in 30 minutes and ready for recoating in just one hour. It forms a smooth, tight, and water-resistant film, suitable for a wide range of surfaces including iron railings, steel doors, metal panels, ductwork, and galvanised gutters. The rust-inhibitive properties make it perfect for new metal applications, while also effectively blocking stains, graffiti, and grease spots. Approximate coverage is 10m per litre.