As you can see in the picture to the right…this fence has seen better days! The underlying metal is raw steel whose main component is iron. Once the raw metal is exposed, it immediately starts to react and turns to iron oxide rust, which in time will eat through the surface creating pits and holes If you are considering a fence like this , be sure to request a heavy galvanizing treatment before painting….this has to be done in a shop that specializes in galvanizing. Galvanizing is a process of applying zinc to the steel….you will get many more years out of your metal if it is galvanized.
The key here is to remove all loose/flaky rust by wire brush/wire wheel on a grinder and/or a abrasive grinding wheel. And do not forget to clean and degloss the remaining sound coating. To get good adhesion of topcoats, the surfaces must be chalk free and deglossed.
If your project is a gate that is removable, the absolute best system is to remove the gate, take to a sandblaster for blast cleaning to bright metal and then have it either powdercoated if you live in a dry area or have a marine primer/finish shop applied.
Prep tools needed: