A periodic mist of water will speed up the oxidation process, especially if you live in a dry climate. Vinegar can be sprayed onto the planter to give it the rusty look in minutes.
As Corten Steel Planters are designed to rust, they will begin to show signs of rusting if left outside for a few weeks and Mother Nature has her way.
When you first receive the planter, wash it with warm water and soap if you do not want to wait a few weeks. Oil will be removed and the water will react with the metal, causing oxidation (rusting). If you live in a dry climate, a periodic mist of water will help accelerate the oxidation process.
The weathering steel Corten starts out as a typical steely grey colour and develops a warm, rust-colored patina over time. Unlike rust, however, this patina is non-corrosive and doesn’t affect the steel’s integrity.
Vinegar can be sprayed directly onto the planter to give it the rusty look in minutes. It washes off with rain, so the next time it rains, your rust will be gone. It will take only a few months, with or without vinegar, for the planter to gain a natural layer of rust and seal.