assigned faces

I'm following a guitar tutorial, and I created a material for the sides of the guitar. I assigned it to the sides, but in rendered view I get a band of the other material above and below the side material.

rendered view

Any Idea why this is happening? Any help is appreciated!

EDIT: .blend file

  • 3
    $\begingroup$ Subdivision surface modifier is the problem. Select the side material faces in edit mode and expand (Ctrl Numpad+), then assign them to the side. $\endgroup$ – Leander Dec 8 '17 at 9:31

The subsurf modifier is smoothing the edges which allowed the above material to bleed out to the sides.

Add two loop cuts to the sides to fix it. (shortcut ctrl+R, then sroll up once) enter image description here

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