POR Products ® is known for formulating products with the capabilities of creating complete systems for various automotive restoration needs. The POR-15 ® 3-Step Rust Preventive System is designed to stop rust on metal surfaces and ensures the best results when applying POR-15 ® Rust Preventive Coating. The clear-cut process allows for the proper cleaning, prepping, and coating; and when used correctly, our 3-Step System creates a non-porous surface that seals and protects metal from water, chemicals, and salt, and other corrosive contaminants.