🟢Substance Painter Tip:
The Passthrough blend mode in combination with the Smudge tool lets you adjust generated/filter results in a non-destructive way.
E.g.:
The Blur filter operates in 2D space, which can cause visible seams at the UV island borders.
A fix for that is to add Paint above the Blur and use the Passthrough blend mode.
Passthrough allows you to smudge the output below it. Works the same for standard layers!