POR-15 Rust Preventive Coating is a high performance coating designed to paint directly on prepped rusted or seasoned metal surfaces to stop rust permanently. POR-15 Rust Preventive Coating is non-porous and seals and protects many surfaces from water chemicals fertilizer salt and other corrosive contaminants. Also this POR-15 rust inhibitor and encapsulator is able to be painted over surface rust. This anti-rust coating paint is an effective anti-corrosive and rust preventive coating that offers superior chemical resistance due to its dense cross-linked molecular composition and non-porous attributes.The secret lies in POR-15 Rust Preventive Coatings curing process. Most paints dry through evaporation but POR-15 Rust Preventive Coating dries faster when moisture is present.