POR-15 Six Pack Stop Rust System is designed for the hobbyist or professional who has a lot of small projects or just likes the flexibility of having multiple cans during a long restoration project. If you've used POR-15 you know that it is sensitiive to air, water or oil getting into the can. That's why seasoned users try to use up a can as soon after opening as possible. Now with this incredibly convenient six pack, you can eliminate waste and move quickly through your projects. Each 4oz can covers 6 square feet of metal with two coats. So that means you can cover up to 36 square feet total with both coats. We've used small cans to paint a bumper, a tongue, a propane tank rack and many other small jobs.