Mohamed Daoui has shared a pack of materials he created in Octane.
Quixel team for their amazing shader ball that I used
Grant Warwick for his shader ball which is included in the c4d scene
I have also included the corona shader ball from corona-materials.de
I also included a modified Quixel shader ball with octane logo on it if you want to use it
also big thanks to Threedscans for the awesome dog scan that I used as a testing object
Texturelib for their textures
Hdrlabs for their HDRI
The artist mixed the dirt material with the rusted metal (both included). Experiment with them or dissect to learn more:
The layout that he used to create these materials: