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
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-tool-bleeds-on-other-uv-islands.html
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