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! 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 for complete coverage Covers 10 sq. ft. Fully cures in 24 hours