POR-15 Top Coats have attributes similar to POR-15 Rust Prevention Coating, but with no sensitivity to UV light. All are flexible, non-porous, extremely scratch resistant and chip resistant and will strengthen when exposed to moisture. Use over POR-15 Rust prevention and other finishes. They will protect against corrosion and won't crack, peel or chip! Chassis Coat has a semi-gloss appearance. For maximum durability Chassis Coat should be clear coated.