Steel Rain Gutter has been around in various forms since the industrial revolution. They have allowed rain gutter to be manufactured in one place and shipped to building structures across the country. To prevent the steel gutter from quickly rusting, they are coated in zinc, called galvanizing. Unfortunately, the zinc deteriorates and the steel becomes exposed and rusts. This kind of gutter is often painted to match the house with common house paint.
There were problems with this antique system. The rain gutter lengths were usually limited to 10 feet, to facilitate shipping. This meant that gutters had to be coupled together if you wanted to form a long channel. Eventually leaking occurred at these coupling, or connectors, and caused leaks. In addition, they eventually rusted and needed replacing. They required maintenance, which meant that they frequently needed repainting, since paint seldom stuck to the metal for very long.