Cavity Protection Ensures protection to cavity areas where the paint does not reach and safeguards the vehicle from corrosion for years. Cavity treatment helps maintain vehicle’s structural integrity.Deep penetration into open seams and crevices (welding joints), reaching areas that are inaccessible to high viscosity products.Inhibits further rust for used cars.Drill free spray action. Penetrates smallest of cavitiesWax based film to protect hard to reach areas from cavities and corrosion5 year warranty