Rust is an iron oxide, a usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture. Several forms of rust are distinguishable both visually and by spectroscopy, and form under different circumstances.
Details
Product: , Fast Deoxidene, Stevensons Etch Primer, Stevensons Universal Undercoat
Possible Cause
Metals contains iron, and most kinds of steel, will rust when exposed to air and water. Rust is just iron oxide, usually with water molecules incorporated in it too. It usually takes the form of an orange flaky powder on the surface of the metal.
Rusting has several effects on metal objects, including making it weaker and damaging the surface. Rust can make holes in sheets metal.
Solution
Remove all loose and flaking particles. Remove rust with Fast Deoxidene, as per product instructions.