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I have an object with two non intersecting UV Maps. One UV Map (round.red.light.decal) is to place a red light decal (round.red.light.png). The other UV Map (rust.map) was used to draw an image mask (cabin.rust.mask.png).

I have my nodes as such...

enter image description here

But I have some phantom rust that I did not draw in my mask. The face the red light is on isn't even in the rust UV map.

enter image description here

Thanks for any insight. Here is my blend file https://drive.google.com/open?id=0B8ZnFrE6fxi_ZDNIanAyQ001RlE

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    $\begingroup$ I can't open the file now ,but try selecting everything in edit mode while viewing the rust uvmap probably the face mesh is misplaced $\endgroup$ – Chebhou Oct 26 '17 at 5:55
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    $\begingroup$ I did as you suggested and everything looked as it should be. I reset the red light uv map because I removed it by accident. That seemed to fix the problem. I don't know what the problem was or why it was fixed. But thanks for your suggestion. $\endgroup$ – deanresin Oct 26 '17 at 6:10
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When vertices touch on UV map, you might get stray color effects like that.
You want a little bit of space between each UV "island"

Edit mode > Mesh > UV Unwrap > Smart UV Project
Island Margin > something small, like 0.05

Island Margin

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    $\begingroup$ This will create new UV map which can be undesired if the OP already unwrapped their mesh and would like to work with existing map $\endgroup$ – Mr Zak Oct 26 '17 at 13:49
  • $\begingroup$ Yeah, that's true. It will create a new UV map. I should have pointed that out. I was thinking that deanresin already solved his issue, so wasn't actually gonna do this right away, and it was just info to keep in mind for next time. $\endgroup$ – Doyousketch2 Oct 26 '17 at 18:15

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