In this video you will learn how to use the shader editor to make photorealistic procedural rust. This will quickly improve your renders and since it's procedural, you can edit the materials however you like. Making rust is one of the easiest ways to add surface imperfections to your objects and adding scratches on top is the extra bit that pushes your renders to the next level of realism.
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This video was very complicated for me to edit since I'm used to recording my audio and video separately but it turned out alright.