Rustyfy

With this geometry node based file you can add rust to any of your asset super easy and fast.

All nodes named and group so super beginner friendly.

You can use this project file or just simply append it to you existing file.
Add modifiers, than chose rust and just move the empty around how you wish.
Animatable or just for single render image.

You will get 2 of my material from my material addon with this purchase. 

For the add on link below.

https://blendermarket.com/products/180-procedural-material-add-on