Answered
Brush has no material
In the old substance painter at default, there should be a grayscale slider in the grayscale tab when doing the paint mode which is now missing on my painter 3D. Am I missing something here is is this a bug?

In the old substance painter at default, there should be a grayscale slider in the grayscale tab when doing the paint mode which is now missing on my painter 3D. Am I missing something here is is this a bug?

nevermind, found the issue.
They have separated brush and physical paint.
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