There are no solvents or strong acids in Rust Doctor. This allows you to restore rusty surfaces without the fear of toxic fumes or potential skin irritation. Rust Doctor can be sprayed in an enclosed environment without the need for special breathing equipment. Clean-up after using Rust Doctor is easy and only requires washing brushes and spray equipment with soap and water. Rust Doctor is a one step process and does not require any chemical preparation of the rusty metal or rinsing after it is applied. Shelf life is two years and the container can be opened and closed as many times as necessary. And, unlike many other solvent-based rust paints, Rust Doctor is completely non-flammable! It is an ideal product for customers who are concerned about the risk of fire whether at home or at the workplace.