Converts Encapsulates & Seals Rust On Internal Surfaces Phenolic Resin With Zinc Additive Eliminates Further Corrosion Can Used In Several Places Such As Doors, Etc... Internal frame coating is formulated to convert and encapsulate the rust INSIDE your frame. This formulation also incorporates zinc phosphate to further protect the metal from future corrosion. The viscosity is stabilized to assure proper flow and penetration to the existing corrosion and will yield complete coverage when sprayed with the included conical nozzle. Easy to use, must have product, that is aerosolized to simply spray the entire inside of the frame with the supplied extension tube and conical nozzle for complete coverage and elimination of the rust for years of protection. Fully cures in 24 hours.