Internal Frame Coating destroys rust hiding inside the chassis, so it doesn’t rust its way through You spend time and money restoring a chassis...but what about all that rust inside the frame? Use our Internal Frame Coating to make your chassis rust-free throughout! Penetrates under the heaviest surface rust. If not treated, the exposed metal surface will continue to rust and begin to show as paint flaking, pint holes or even worse: structural frame failure. - Tough phenolic resin penetrates, converts and encapsulates the rust on the internal surface - Zinc phosphate seals it to prevent future corrosion - 24\" long tube with \'conical nozzle\' reaches in to spray coating in a radial pattern for complete coverage. The extension nozzle is reusable, simply attach into a can of Pre-Painting Prep and purge it after each use. - Aerosol covers 10 sq. ft., qt. covers 50 sq. ft. - Green in colour - Fully cures in 24 hours