By default Paint Effects uses UV set map1, but you can link your Paint Effects strokes to different UV sets on your polygonal surface. For example, if you have different UV sets defined for different projections, you can link the Paint Effects strokes to the UV set that gives the best result.
When you link Paint Effects strokes to a UV set, all the strokes attached to the polygon are linked. You cannot link individual strokes to different UV sets.
To link attached Paint Effects strokes to a different UV set
The left panel lists all the Paint Effects strokes that are attached to the selected polygon.
The right panel lists mesh nodes with UV sets for the selected polygon. If more than one polygon is selected, only the last selected polygon is listed.