Often, antique and well-used firearms will develop a patina on the steel after the bluing, parkerizing, or other finish has worn off. Firearms in this condition are generally considered more valuable than ones that have been re-blued or parkerized. The patina protects the firearm from the more damaging rust that would occur if the patina were polished off. Rust is sometimes valued as a patina. Examples are rat rods, custom cars and meant to look like early 1940s hot rods. They glorify rusted hot rods that have an almost cartoonish appearance. Some are actually rusted metal while others have a faux (false) finish intended to look like rust.