POR-15 Gloss Black Top Coat aerosol is a direct-to-metal (DTM) paint designed to work incredibly well in all applications where there is a need to help preserve substrates susceptible to corrosion. Under exterior exposure POR-15 Top Coat has exceptional long-term sheen and color retention. POR-15 Top Coat can be applied directly to metal substrates or previously painted surfaces, with no need for a primer or undercoat, and is formulated to form a robust barrier that sheds moisture to provide long-lasting protection. POR-15 Top Coat provides excellent adhesion and when used over POR-15 Rust Preventive Coating, works to provide a permanent barrier to corrosion. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.