How to make rust - Blender tutorial

Blender 4 beginner tutorial on how to create rust in Blender in 4 different ways. First, a guide on how to achieve a fully rusted object, resembling weathering steel, also known as Cor-ten steel. Then, learn how to generate rust patches automatically. Following that, add rust patches with holes for added realism. Lastly, learn how to texture paint with rust. Note: This requires that your object has a UV map. (This final method is inspired by @Ryan King Art, a youtube chanel I highly recommend. )
A rust patina can really add to your project and object!
0:00 - Introduction
0:23 - Fully rusted - Cor-ten steel looking rust
3:28 - Rust patches - Procedural generated
6:00 - Heavier rust patches with holes
9:07 - Manual painting with rust. This requires a UV map