POR-15 45408 Semi Gloss Black Rust Preventive Paint - 1 Pint POR-15 Rust Preventive Coating is a high performance coating designed for application directly on rusted or seasoned metal surfaces It is non-porous, seals and protects surfaces from water, chemicals, salt & other corrosive contaminants. An effective anti-corrosive and rust preventive coating that offers superior chemical resistance The secret lies in POR-15 Rust Preventive Coating's curing process. Most paints dry through evaporation, but POR-15 Rust Preventive Coating dries faster when moisture is present.