Aervoe 7007 Cold Galvanizing Compound-Spray Can 93% zinc-rich coating bonds to iron and steel Sacrificial anodization of zinc occurs when the surface is scratched or broken; zinc coating will corrode while continuing to protect the metal surface it covers USDA Category 21 acceptable Uses: Apply to welded joints, guard rails, bridges, metal chain fences, pipes, TV towers, refinery piping, heavy equipment, corrugated metal buildings, etc. Ideal for harsh industrial environments, such as aviation, marine, manufacturing and petroleum applications.