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  • $\begingroup$ I think it's the best one can do at this stage. $\endgroup$
    – Maulik Sharma
    Commented Apr 20, 2021 at 7:16
  • $\begingroup$ @MaulikSharma I edited my answer, at the bottom I've got another solution. In the end it's not necessary to have many different materials on one object, you could make a single one of them. $\endgroup$
    – Gordon Brinkmann
    Commented Apr 20, 2021 at 7:22
  • 1
    $\begingroup$ Why didn't I think of that. I have used that approach so many times in my projects🤦‍♂️🤦‍♂️ $\endgroup$
    – Maulik Sharma
    Commented Apr 20, 2021 at 7:38
  • $\begingroup$ Thank you for the comment!! Gordon Brinkmann. You gave me many hints. I'll try several ways for assigning. Whether I succeed or not, I'll leave the comment later. I need some time. $\endgroup$
    – Varrick
    Commented Apr 20, 2021 at 8:15
  • 1
    $\begingroup$ Of course this would have been the right order - but in your question you said you can't or don't want to duplicate the one can because you put so much effort in the others before. The problem you describe can be easily solved with a mask texture. Make it black where it should be plastic and white where it should be metal. Plug that into the Metallic input of a Principled BSDF. Now you have metal and plastic masked out. If you want different Roughness for plastic and metal, e.g. 0.2 for plastic and 0.4 for metal than map the 0 and 1 to 0.2 and 0.4 with a Color Ramp or Map Range node. $\endgroup$
    – Gordon Brinkmann
    Commented Apr 20, 2021 at 12:52