Zinsser Perma-White (Interior)For application to interior walls, wall cavities, ceilings, trim, doors, and related paintable surfaces. Available in; 2. 5 litre and 5 litre units. A high performance acrylic, all purpose interior mould resistant paint. Product Description: Zinsser Permawhite is a high performance acrylic interior paint uniquely formulated to beautify and protect interior surfaces while preventing mould and mildew growth on the paint film for 5 years. Perma White