All the materials are basic materials and they haven’t been made for a specific object
All the materials can be transferred to eachother and most of them are included in the available samples
But if you want to apply them to your own object you should consider these instructions :
1. Adjust the appropriate Roughness for the Object
2.Adjust metallic based on the roughness of the object
3.For the edges and any other points of the object you only need to add a mask brush
4.Dont change the colours as much as you can but if you want to do so I suggest you start with a base layer and if you need add more layers later, but maximum 3 layers would be enough.
5.keep the roughness and metal balanced as much as it’s possible (based on the material)
6.Hard and soft brushes are defined for the layers and I suggest that you do the same for your own brushes.