Permatex Extend Rust Treatment Spray sprays on clear and effectively converts rust into a black, metal-protective coating. This treatment leaves a tough surface that can be easily painted over, making it i for automotive repairs and maintenance. Specially formulated to work well with body filler and fiberglass, it ensures durable protection and a smooth finish. The aerosol can design allows for easy application, especially in hard-to-reach areas. This product comes in a 10.25 oz. aerosol can, for tackling rust issues with precision and convenience. Model Number: 81849