Ho to paint ONLY on one UV-shell without touching another

[Dead_Lord]

  Like you can see here, I did paint only once on one UV-shell, and it painted another as well. Their UVs not touching each other. I can assume it happens becaurce they're one model. But I thought that's why we use UVs, to make one tecture file with different materials inside

[Cedric Marchessoux]

Hi if your UV shell (islands) are separated in the 2D viewport, then you can use the polygon tool to select them individually and apply a material.

[Josep_Maria_Saez]

Use the power of the mask, my friend. polygon Fill is the key

[christianh80011326 · Accepted solution]

I bit too late, but I think this is the solution yu were looking for (at least I was):

To avoid the bleeding on other UV islands when painting in the 2D view simply change the Alignment setting in the tool parameters:

https://helpx.adobe.com/substance-3d-painter/technical-support/workflow-issues/tools-issues/paint-to...