Factory-sealed gallon of POR-15 Rust Preventive Paint, acknowledged worldwide as the finest rust preventive coating ever developed, stops
rust permanently and is the product by which all others are measured.

POR-15® is a high-tech, high performance rust-preventive coating designed for application directly on rusted or seasoned metal surfaces. It dries to an incredible rock-hard, non-porous finish that won't chip, crack, or peel, and it prevents rust from recurring by protecting metal from further exposure to moisture.

Use it to coat rusty frames, floor pans, farm equipment, marine equipment, or even a heavily corroded battery tray.

I have one gallon of grey available for $100 shipped.