COPPERLAC is an air-dry lacquer, engineered to provide highly durable interior and exterior protection on patina copper. The addition of UV and corrosion inhibitors to COPPERLAC assures endurance in harsh conditions such as arctic freezing, desert heat, beachfront salt air, and acid rain. The satin finish is just right - neither too glossy nor flat. It has been discovered that even a blow torch cannot discolor a brass fitting protected by COPPERLAC.* COPPERLAC air dries to touch in less than 5 minutes and dries hard to durable finish in about 3-4 hours.* COPPERLAC should give satisfactory interior/exterior protection for at least ten years under normal conditions. Considerably longer life is expected.