I want to paint in screw alphas but cant seem to do how.

[BaidDSB-3D]

So i want control over the color of the screws, and i want rust/ edge wear to maybe affect them [soo i guess anchor points?].

How do i do it? I just want to simply click the hard normals over the paint layer

[davescm]

You could create a screwhead as a decal in Substance Designer. That would give you control over the height, shape colour, metalness etc

Dave