Karnak 404 Corrosion Proof is a selfpriming, modified acrylic coating designed to go over sound and properly prepared rusty metal surfaces to prevent the development of new rust.
404 Corrosion Proof is recommended for use as an elastomeric coating over properly prepared metal roofing including metal that is sound but showing surface rust. This coating imparts excellent corrosion resistance, adhesion, and low temperature flexibility. The coating is intended for use as a base coat on new metal and lightly rusted metal roof surfaces that have been properly cleaned prior to the application of 535QS Enviro-Lastic, 501 Elasto-Brite, or 529 Renu-White topcoats. New metal surfaces must be allowed to age 30 days before coating.