Material showing on wrong faces I'm following this tutorial and I have applied a material to the body mesh and when I apply the material to the faces to the side of the mesh, I can see the top/bottom material is showing on the top and bottom parts of the side faces.

This is the rendered view:


http://i.imgur.com/uvMBfQq.png

and this is the wireframe showing the selected faces which the side material is applied to:

http://imgur.com/zx4JW32.png

I'm not sure why this is happening, can anyone advise?
Thanks
You need more geometry. The subsurf modifier works by interpolation, meaning that is subdividing the geometry, the boundaries for materials are also interpolated. On the sides of the guitar you need to add supporting loops, those will help you define the edges for the material as well.

As an example of the issue, this cylinder has two materials, one for the top and bottom faces, and one for the sides. The subsurf modifier interpolates mapping of the materials clearly. Adding supporting loops will fis the mapping error: