POR-15 is known for formulating products with the capabilities of creating complete systems for various automotive restoration needs. The POR-15 3-step system is designed to stop rust on metal surfaces and ensures the best results when applying POR-15 rust preventive. 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.