Creating a procedural rust is a lot easier than you thought, and I will be explaining it in a very easy way with much shorter steps.
In this tutorial, I will show you how to create procedural rust in Blender.
We need 3 new nodes to create this procedural rust. We need a noise texture, a colour ramp, and a bump node.
Blender Procedural Rust In few Nodes
Step 1: Add noise texture and bump node.
Step 2: Connect Fac to Hight and normal to normal
Step 3: Add a color ramp node And put it between the noise texture and the bump.
Step 4: Increase detail in noise texture
Step 5: Move white point towards the black point.
Step 6: Connect color ramp to metallic socket in principle bsdf
Step 7: Reduce roughness inside the principle bsdf
Step 8: Add color ramp and connect it to the Base color Of the principle bsdf
Step 9: Connect first color ramp to the 2nd one.
Step 10: Move black slider towards white in color ramp (When ever you change the black color you will change the color of rust)
Extra: If you don’t want your rust to be engraved in your modal, then check the invert check mark in the bump node.
Extra 2: To make your rust less bumpy, reduce the strength of the bump node.
Extra 3: Increase roughness in the noise texture to make your rust more organic.
