The Patina Process
It's important to understand the nature of raw steel and the unique ways in which it will age over time. Patina is a natural weathering process which occurs when metal is exposed to oxygen and moisture that will gradually change bare steel from a bluish gray color to a dark reddish brown. This natural process varies the appearance of each piece making every Pyro unique.
Patina vs. Rust
This is a bit like geometry where a square is a rectangle but a rectangle is not a square. It's true that rust is a part of the patina process but whereas rust has a well-deserved negative connotation a mature patina is actually a natural protective coating that will preserve the integrity of the underlying metal.
The Pyro is constructed from 3/16" plate steel that is three to five times thicker than grills and fire pits from other manufacturers. The surface rust that forms in the early stages of the patina process will not rust through the thicker steel of the Pyro as it will on thinner metal and will gradually convert into an aesthetically pleasing protective shell that will last for decades.
One thing to note is that water runoff during the early stages of the patina process can stain wood, concrete, or other light colored surfaces so keep that in mind when selecting the location for your Pyro.
While patina is a natural process that can take months to complete you can choose to accelerate or delay the changes.