Galvanized Roof Rust

I have used both regular paint and roof coat on old metal roofing with pretty good results.

Galvanized roof rust.

Galvanized metal is coated with a layer of zinc to protect the iron or steel underneath. It is not simply a cosmetic problem however. Rust corrodes metal and if left untreated it can cause. I like the fiber in the aluminized roof coat as well as in the black nearly tar roof coat.

Most metal roofing is made of galvanized metal or coated to prevent rust from occurring but standing water and the heat generated by direct sunlight can wear the roof s protection away. The fiber acts a bit like a tire plug in the old nail holes and prevents leaks and it sticks well. Rust is the reaction of oxygen moisture and metal that results in reddish brown blotches. The roofs i have done have lasted a minimum of 20 years now.

Galvanized metal roofs are coated with a layer of zinc that inhibits rust. If you are preparing to paint a rusted galvanized metal roof pay special attention to surface preparation or you will have a recurrence of rust and or flaking. But galvanized metal which exhibits a shiny adherent but rust colored stain is not truly rusting. Rather this is just a phenomenon that often occurs in galvanized materials due to intermetallic alloying of iron and zinc i understand and is not indicative of the end of the useful life of the galvanizing.