Dinitrol products are the ultimate rust treatment and corrosion protection. Simple to use and effective result even under several conditions, Dinitrol is commonly used for rust proofing automotive vehicles. Perfect for underbody chassis, cavities, inside doors, sills, etc. you can extend the working life of your classic vehicle and reduces costly repair work. The Dinitrol Rust Proofing Aerosol Kit contains all you need to treat and protect your vehicle from corrosion: - Dinitrol Rust Converter and Primer aerosol RC900 to convert rust - 2 aerosol cans of Dinitrol ML Cavity Wax for cavities and inside the doors. Perfect to stop existing rust and prevent corrosion in the future. - 4 aerosol cans of Dinitrol HS 3125 , a non dripping solvent based black underbody coating rust prevention. - 4 aerosol cans of Dinitrol 4941 black solvent based underbody coating to cover the Dinitrol HS3125. - 3 aerosol E xtension Hoses to get into the cavities