You can invert the background of the mask by doing Right-click > Invert mask background. This is useful if you want to avoid destroying the effects attached to a mask.
How do you invert colors on a substance painter?
Pressing X allows to invert the brush color when painting on a mask.
How do you make a smart mask in substance painter?
To create a Smart Mask, simply right-click over a layer and choose ” Create smart mask “.