NS4 is a high-performance water-based metal primer and rust treatment with anti-corrosive pigments to stop and prevent rust on new and weathered metal. Suitable for domestic, industrial, and automotive uses. Ns4 will provide you with long-term protection against corrosion. Ns4 is quick-drying and can be handled within an hour of application. It provides good flow and leveling properties, leaving your surfaces smooth and ready for paint. Ns4 emits no toxic fumes so can be safely used in a confined space without compromising the safety of your loved ones.