POR-15 Engine Enamel is a direct-to-metal coating 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 Engine Enamel has exceptional long term gloss and color retention and can be applied directly to rust, with no need for a primer or undercoat, and is formulated to form a robust barrier that sheds moisture to provide long lasting protection. It provides excellent adhesion and when used over POR-15 RUST PREVENTIVE COATING works to provide a permanent barrier to corrosion. POR-15 Engine Enamel is formulated to keep engine surfaces from pitting and rusting while maintaining color and a performance gloss finish.