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This question already has an answer here:

I have a complex object I am trying to texture with a real locations textures. I have the faces I want selected in edit mode and I UV unwrap them by projecting from bounds and it looks fine, like only the faces I selected are being unwrapped, but when I go to apply a new material, the material selects ALL of the faces, the ones I want, and the ones I don't want. What's the best way to get by this?

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marked as duplicate by cegaton, Ray Mairlot, VRM, user7952, David Mar 23 '15 at 17:35

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  • $\begingroup$ How many materials do you have on the mesh? $\endgroup$ – Denis Mar 23 '15 at 15:41
  • $\begingroup$ There are currently zero on the mesh. Each mesh I have will only have a total of 2 materials, I just can't figure out how to separate things properly. $\endgroup$ – Daniel Mar 23 '15 at 15:44
  • $\begingroup$ When you add a first material it will be applied to all the mesh. $\endgroup$ – Denis Mar 23 '15 at 15:49
  • $\begingroup$ Oh sweat okay. So after the first material is on there, then I can go back and select the specific spaces and unwrap them? $\endgroup$ – Daniel Mar 23 '15 at 15:51
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    $\begingroup$ You need to apply second material to those specific faces. $\endgroup$ – Denis Mar 23 '15 at 15:53
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If there are no materials applied to the mesh, first material that is created will be applied to whole mesh. There can not be part of mesh without a material. You have to create additional material for those specified faces.

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