This week we’ve started a project at the La Mirage condo complex on the south end of Ocean Boulevard. We were contracted to prime and paint the metal walkways and railings. Prior to priming we treated the rust (lots of rust!) on the steel. We spent the first scraping all 4 floors of all the loose rust. Most of the big chunks were on the underside of the walkways where they had just recently welded new plates to reinforce the walkways.
If you’ve never used Ospho, it’s really cool stuff. It basically causes iron oxide (rust) to chemically change to iron phosphate – an inert, hard substance that turns the metal black. It inhibits any new rust from forming. You can buy it at Sherwin-Williams by the quart or gallon. A gallon costs around $25. We simply poured a gallon into spray bottles, and sprayed heavily on the rust areas. We let it sit for 24 hours, and will lightly pressure wash all the surfaces before priming and painting.
Get more detailed information about Ospho on their website – http://www.ospho.com/index.htm