POR-15 to restore your car with a rock-hard, non-porous finish that won't chip, crack, or peel and prevents recurring rust by sealing your metal against exposure to moisture. The high-tech, high performance, rust-preventive coating designed for direct application on rusted metal surfaces not only covers the existing rust, it also prevents the re occurrence of rust. these non-porous POR-15 rust preventive paints are ideal for a quick improvement. Rust Proofing!